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English Grammar Step by Step:
• 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


Gramàtica anglesa de nivell mitjà:
• Matèries


Gramàtica anglesa per a principiants:
• Índex
• Unitat 1:  A, an, some, any i the
• Unitat 2:  Some, any + body/one, + thing, + where
• Unitat 3:  Els pronoms personals i els adjectius i pronoms possessius
• Unitat 4:  Els pronoms reflexius, el pronom recíproc "each other" i els pronoms personals de complement
• Unitat 5:  Llista de verbs irregulars anglesos


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Mike
User / Moderador

Jan 7, 2010, 5:52 PM


Visualitzacions: 398096
Re: [Hosseinabadi] Question

Hello!

The correct answer is "could not attend", as it means "was not able to attend". When could means "be able to" or "be allowed to", could is followed by a simple infinitive. More information at http://www.polseguera.org/...mmar/modal_verbs.php

Could have + past participle is used for possibility in the past. More information at http://www.polseguera.org/...mar/modal_verbs1.php

Examples:
I could swim like a fish when I was five. (ability)
She could have gone to visit her grandfather. Let's ring him to see if she's there.
You could have taken the lift. Now it is working again. (Why didn't you take it?)
You should not have entered that area alone. It is very dangerous. You could have been robbed.

Best regards,
Mike


(Aquest missatge va ser editat per Mike el dia Jan 11, 2010, 9:31 PM)


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