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English Grammar Step by Step:  Plegar 
• Contents
• Introduction
• Notes
• Unit 1:  Negative and interrogative sentences
• Unit 2:  Short answers
• Unit 3:  Question tags
• Unit 4:  Questions and exclamations
• Unit 5:  So, neither, nor, either
• Unit 6:  Be, used to, would, be/get/become used to, dare, have, get, become, grow, go, turn, fall and feel
• Unit 7:  Verb tenses: forms
• Unit 8:  Irregular verbs
• Unit 9:  Verb tenses: uses
• Unit 10:  Personal pronouns, possessives and reflexive pronouns
• Unit 11: The genitive case
• Unit 12: Singular and plural nouns
• Unit 13: Gender
• Unit 14: A, an, some, any, no, not, none, each, every and the; compounds of some, any, no and every
• Unit 15: Neither, not...either, none, not...any, both and all
• Unit 16: A few, few, a lot, lots, a little, little, many, much, no and plenty
• Unit 17: Enough, too, so and such
• Unit 18: Comparative and superlative sentences
• Unit 19: The adjective order
• Unit 20: Relative clauses
• Unit 21: Do and make
• Unit 22: Modal verbs
• Unit 23: Infinitives, gerunds and present participles
• Unit 24: Conditional sentences
• Unit 25: Passive sentences
• Unit 26: Reported speech
• Unit 27: Purpose
• Unit 28: Word order
• Unit 29: Inversion
• Unit 30: Connectors
• Unit 31: Prepositions
• Unit 32: Phrasal verbs


Gramática inglesa de nivel medio:
• Índice
• Unidad 9:  Verbos irregulares


Gramática inglesa para principiantes:
• Índice
• Unidad 1:  A, an, some, any y the
• Unidad 2:  Some, any + body/one, + thing, + where
• Unidad 3:  Los pronombres personales y los adjetivos y pronombres posesivos
• Unidad 4:  Los pronombres reflexivos, el pronombre recíproco "each other" y los pronombres personales de complemento
• Unidad 5:  Lista de verbos irregulares


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Gramática inglesa de nivel avanzado paso a paso (English Grammar Step by Step)


     UNIT 22
     MODAL VERBS1


   Insert the appropriate modal verb in the spaces provided.
   When there is a verb in brackets, put it into the correct
   form. 

1  Examples: (ability)
   She can play the cello/She is able to play the cello.
   When I become an architect, I’ll be able to draw plans.
   He has been able to calculate the cost of building
   and the material needed since he became a quantity surveyor.

   Can usually has a present meaning2. Be able to is necessary
   when can3 is impossible, ie in future tenses, perfect tenses,
   and so forth.

a  She __________ memorize a lot of things just at one glance.
b  When the day breaks, we __________ reach the top of the
   mountain.
c  He __________ play volleyball since he was a kid.
d  You used to __________ persuade people to do things.
e  I __________ speak and write five languages.


2  Examples: (past ability)
   As a girl, I could/was able to run and jump all day without
   getting tired.
   On that occasion, I was able to escape/I managed to
   escape/I succeeded in escaping her clutches.
   On that occasion, I couldn’t/wasn’t able to escape her
   clutches.
   Last night I could hear what my neighbours were talking about.

   The first sentence implies a general ability in the past.
   In the second, we are referring to a particular situation4.
   In the negative and with perceptions verbs5, we normally
   prefer could.

a  When I entered the hut, I __________ see that somebody
   had just been there.
b  He was attacked by two men with a strong constitution
   last night, but he __________ beat them up.
c  When he was eighteen, he __________ sing and dance
   beautifully.
d  Last night I __________ convince my parents to allow me
   to see that late-night horror film.
e  I asked her to jump into the water, but she said that
   she (not) __________ swim.


3  Examples:
   She could/would be able to help us if she were6/was
   alive. (present or future)
   She could have helped/would have been able to help us
   if she had been alive. (past)

   Note the use of could and be able to in conditional7
   sentences.

a  If I hadn’t so much work, I __________ (fix) the fuse.
b  If you had gone through the normal channels, you __________
   (get) the loan.
c  If he had been born in 1940, he __________ (play) with Pelé.
d  If she were here, she __________ (console) him.
e  If I had a screwdriver, I __________ (unscrew) this screw.


4  Examples: (permission)
   She may/can/is allowed to8 finish work early today.
   He has been allowed to do what he wants all his life.
   They can/may/will be allowed to go to the disco when
   they get good school results.
   You may/can9 go skiing next week. (= I allow you to go
   skiing next week.)
   Next month I’ll be eighteen. Then, I’ll be allowed to
   do what I wish.
   He can stay up late whenever he likes.

   May is formal; can, informal. Can must be used to express
   general or habitual permission, as in the last example above.
   Be allowed to is necessary when may or can are not possible,
   ie in perfect tenses, infinitives and so on.

a  You __________ stay here for a short while, but don’t be long.
b  From tomorrow onwards, you (not) __________ smoke in your
   bedrooms.
c  You __________ take my hand.
d  We (always) __________ park in this street; but from today on,
   we won’t.
e  You __________ ask for my advice every time you need it.


5  Examples:
   Can/Could I go to the lavatory?’
   ‘Yes, you can/No, you can’t.’
   ‘May/Might I hold your hand?’
   ‘Yes, you may/No, you may not.’

   Can is informal, and should be avoided in formal situations.
   Could is neutral; may, the most formal. Might expresses
   uncertainity; or in other words, it indicates that you are
   not very sure about the answer: maybe you are hoping a
   negative reply.

a  ‘__________ I use your phone, Josephine?’
   ‘Please do!’
b  ‘__________ I come in, please?’
   ‘Yes, you __________.’
c  ‘__________ I bring my friends over this afternoon?’
   ‘No, you (not) __________. They’re terribly spoilt.’
d  ‘__________ I kiss you?’
   ‘Yes, you __________’
e  ‘__________ I sit down?’
   ‘Go ahead, please!’


6  Examples: (past permission)
   When she was a child, she could/was allowed to watch
   late-night horror movies on television.
   She was allowed to watch a late-horror film on the telly
   yesterday, as it was her birthday.
   She could not/was not allowed to watch a late-night film,
   although it was her birthday.
   She could not/was not allowed to smoke at home when she
   was sixteen years old.

   Both could and was/were allowed to are possible for general
   permission, but could is more usual. Only was/were allowed
   to is used when we are talking of a particular situation.
   In the negative, could not can replace was not/were not
   allowed to.

a  He (not) __________ play the music loud yesterday evening,
   as her mother had suffered an attack of migraine.
b  He  __________ not to attend school yesterday because it was
   his parents’ silver wedding anniversary.
c  When she was fourteen, she (not) __________ go out with boys.
d  When we were kids, we loved going to our grandparents’ place,
   as we __________ stay up late.
e  While she was in hospital, we __________ only see her at the
   visiting hours.


7  Examples:
   We could/would be allowed to get in if we had a permit.
   (present or future)
   We could have got/would have been allowed to get in if we
   had had a permit. (past)

   Both could and be allowed to are possible in conditional
   tenses10, as seen above.

a  If he had got better school results, he __________ (play)
   in the team.
b  We __________ (hunt) here if we had a licence.
c  They __________ (get) into that place if they were of age.
d  You __________ (go) with us if you gave us ten pounds.
e  He __________ (join) us if he hadn’t such a big mouth.


8  Examples:
   Alcoholic beverages may not be served after midnight.
   We cannot/can’t take books out of this library. (Compare:
   Books may not be taken out.→ a notice at a library)

   May not and cannot11 are used to express prohibition.
   May not mainly occurs in formal instructions.

a  People under sixteen __________ order alcoholic drinks.
b  You (not) __________ overtake. There’s a continuous line.
c  You (not) __________ enter the USA without a visa.
d  This room (not) __________ be used without the prior
   permission of the manager.
e  You (not) __________ take my bike!


9  Revision exercise.
a  When I entered the house, the fuse had blown, but I
   __________ see my way in the dark.
b  If you taught me how to do it, I __________ do it alone.
c  If you take one of these tablets, you __________ stay awake
   all night long.
d  You __________ overtake here. There’s a broken line.
e  When you come of age, you __________ see adult films.
f  If dogs __________ there, I would have taken mine with me.
g  If you __________ bring your pet here, everybody would do so.
h  ‘__________ I stand up, sir?’
   ‘No, you __________. The class isn’t over yet.’
i  You (not) __________ look girls up and down like this!
j  You (not) __________ come around tonight! My husband will be
   at home.
k  If you help me, we __________ build a shack.
l  I __________ give you a hand, if you really needed one!
m  I __________ play only in the park. My mom has told me not
   to go outside the park.
n  I’d like to __________ sing as well as you do.
o  When I was your age, I __________ dance for hours and hours
   without getting tired.
p  She __________ win the singing contest last night. In actual
   fact, she was by far the best singer.
q  He had tried to speak to her many times, but without much
   success. Two days ago, however, he __________ see her.
r  Pets (not) __________ 
s  You (not) __________ do such a thing here! Get out!
t  You’re not going to __________ take her with you. (permission)
u  Although I knew they __________ escape, I told them not to.
v  ‘__________ I see Mr Wright, please?’
   ‘Yes, of course.’
w  If you __________ meet the expenses, I’ll see to getting cheap
   labour.
x  ‘__________ I go topless, father?’
   ‘Of course you can’t!’
y  If I had enough money to buy the materials needed, I
   __________ put up a small cottage here. My two sons
   __________ help me too. We’re very handy.
z  When you finish ironing, you __________ watch the telly.


10 Examples: (present possibility12)
   ‘Somebody has just rung the bell!’
   ‘It may/might/could be my sister.’
   ‘The bell! Can/Could it be your brother?/Do you think (that)
   it is your brother?13 

   Might and could14 suggest a more remote possibility than
   may. In the interrogative, may is not usually possible,
   and might is not very common. Instead, we use can or
   could, or other alternatives15 (such as Do you think...).
   Could implies that we are less sure about something:
     Could they be pulling my leg? (I do not think they
     are pulling my leg, but who knows.)
     Can they be pulling my leg? (Do you think they are
     pulling my leg?)
     What could that be? (I found it very strange.)
     What can that be? (Do you know what it is?)

a  ‘Who __________ it be now?’
   ‘I don’t know. It __________ be my goddaughter.’
b  He __________ be working in the garden. I’ll go and see if
   he’s there.
c  ‘He hasn’t come to class today!’
   ‘He __________ be ill in bed!’
   ‘Or he __________ have played truant!’
d  If you tell her now, she __________ go up the wall.
e  She __________ be very plain, but she’s the most incredible
   person I have ever met. I think I have found my life partner.


11 Examples: (future possibility)
   We may/might/could go swimming this afternoon.
   He may/might/could pass his driving test.
   Do you think (that) he will pass his driving test?
   Is it possible/probable16 that he will pass his driving test?
   Is it likely that he will pass his driving test?
   Is he likely to pass his driving test?

   Could17 and might indicate a smaller possibility than may.
   In the interrogative, we generally use one of the alternatives
   given above.

a  We __________ go elsewhere this afternoon.
b  They __________ travel the world next spring.
c  They __________ find my fingerprints.’
   ‘I hope not.’
d  It __________ come to nothing, but we __________18 as well
   try. (= We have nothing to lose by trying.)
e  ‘__________ he’ll help us out until Jo recovers from her
   illness?’
   ‘I think so.’


12 Examples: (general possibility)
   The outskirts of Madrid can be dangerous at times.

   Can19 means here that it is possible for the outskirts
   of Madrid to be dangerous at times. In the past, we
   use could: My father could be very unfriendly, ie it
   was possible for my father to be very unfriendly.

a  People __________ die of a heart attack.
b  This medicine __________ have side-effects.
c  When you were a child, you __________ be a nuisance at times.
d  Oil (not) __________ mix with water. (= It is impossible to
   mix oil with water.)
e  You (not) __________ wash this dress. It must be dry-cleaned.


13 Examples:
   He may/might not find the treasure island.
   He cannot find the treasure island.
   He could not find the treasure island.

   The first sentence means that it is possible that he does not
   find the treasure island; the second, that it is impossible
   that he finds the treasure island. Could not carries the idea
   of condition or concession20: He couldn’t find the treasure
   island (even if/even though he tried his best), that is, it
   would be impossible for him to find the treasure island.

a  You (not) __________ get the push. You’ve been working there
   all your life. (= That is not possible.)
b  She (not) __________ be stuck in a blizzard. It’s not snowing!
c  He (not) __________ recover consciousness. The only thing we
   can do now is to wait and see if he reacts to the treatment.
d  We (not) __________ plant lilacs this year. (We have not
   decided it yet.)
e  Even if we had a key, we (not) __________ get in the house, as
   the front door is jammed.
 

____________________
1  For details about the modal auxiliaries will, shall, would
   and should, see units 7 and 9. For information on used to
   and would, see unit 6, part 2. For information about dare,
   see unit 6, part 3. 
2  Can is possible with a future meaning when we suggest
   something at the moment of speaking: We can play rugger
   tomorrow.
3  See unit 8, remark i.
4  It very often implies some kind of difficulty.
5  And a few other, like ‘believe’, ‘remember’ and ‘understand’.
6  For the usage of were in conditional clauses, see unit 24,
   section 7.
7  See unit 24.
8  Be allowed to is much less common than can or may. Notice
   as well: I allow her to finish work early today. Be
   permitted to is a very formal synonym for be allowed to.
     She is permitted to finish work early today.
     We permit her to finish work early today.
   Be allowed to is neutral. Let is another alternative to
   be allowed to, but less formal:
     I’ll let her go.
     I’ll allow her to go. (neutral)
     I’ll permit her to go. (very formal)
9  Might and could are the conditional or past forms of may
   and can, respectively: I told her that she might/could
   go skiing the next week. See also section 14.
10  For conditional sentences, see unit 24.
11  See section 26 in this unit.
12  Note also:
     You may be my mother’s boyfriend, but this doesn’t allow
     you to order me around. (= I admit that you are my
     mother’s boyfriend; but, despite that, this doesn’t allow
     you to order me around.)
     You might be cleverer than I am, but you are very rude.
     (= Although [you say that] you are cleverer than I am, you
     are very rude.)
13  Compare these sentences:
     Do you think (that) it is your brother? (Maybe the person
     ringing the bell is your brother.)
     Do you think (that) it will be your brother. (I think it
     unlikely.)
     The burglar alarm has just gone off. Do you think (that)
     someone has broken into the house? (Perhaps someone has
     broken into the house.)
     The burglar alarm has just gone off. Do you think (that)
     someone will have broken into the house? (I do not think
     it very likely.)
14  Could often expresses a more remote probability than might.
   This depends on where we put the stress.
15  See the next section.
16  If we say that something is probable, it is more likely to
   happen than if we say say that something is possible.
17  Could usually conveys a less likely possibility than
   might. This depends where we place the stress.
18  Could is not possible here.
19  Occasionally, may could also be used instead of can:
     This expression may/can also occur in a conversational
     context.
     This word may/can only be used in the negative and in the
     interrogative.
     This diet may/can cause side-effects.

   Nevertheless, this is not always possible. We would probably
   not say The outskirts of Madrid may be dangerous at times to
   express general possibility. However, in a bigger context,
   it might be okay: The outskirts of Madrid may be dangerous
   at times, but they are quieter than the city centre. (=
   Although the outskirts of Madrid can be dangerous at times,
   they are quieter than the city centre. See section 10,
   footnote 12.)
20  The same applies to could not when it is used for permission:
   You couldn’t use my car tomorrow (even if/even though you had
   a driving licence). (= I would not allow you to use my car
   tomorrow, or I will be using it tomorrow, so I would not lend
   it to you.)
Author: Miquel Molina i Diez

     Pages: 1, 2, 3 and the key

   Contents
   Introduction
   Notes
1  Negative and interrogative sentences (Page 2 and the key)
2  Short answers (Page 2 and the key)
3  Question tags (Page 2 and the key)
4  Questions and exclamations (Page 2 and the key)
5  So, neither, nor, either (the key)
6  Be, used to, would, be/get/become used to, dare, have, get, become, grow, go, turn, fall and feel (Page 2 and the key)
7  Verb tenses: forms (Page 2 and the key)
8  Irregular verbs
9  Verb tenses: uses (Page 2, Page 3, Page 4, Page 5 and the key)
10 Personal pronouns, possessives and reflexive pronouns (Page 2 and the key)
11 The genitive case (the key)
12 Singular and plural nouns (Page 2 and the key)
13 Gender (the key)
14 A, an, some, any, no, not, none, each, every and the; compounds of some, any, no and every (Page 2, Page 3 and the key)
15 Neither, not...either, none, not...any, both and all (the key)
16 A few, few, a lot, lots, a little, little, many, much, no and plenty (the key)
17 Enough, too, so and such (the key)
18 Comparative and superlative sentences (Page 2 and the key)
19 Adjective order (the key)
20 Relative clauses (Page 2 and the key)
21 Do and make (the key)
22 Modal verbs (Page 2, Page 3 and the key)
23 Infinitives, gerunds and present participles (Page 2 and the key)
24 Conditional sentences (Page 2 and the key)
25 Passive sentences (the key)
26 Reported speech (Page 2 and the key)
27 Purpose (the key)
28 Word order (the key)
29 Inversion (the key)
30 Connectors (Page 2 and the key)
31 Prepositions (Page 2, Page 3 and the key)
32 Phrasal verbs (the key)


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