Contents
1. The verb "to be"
2. The verbs "can" and "may"
3. The verb "have"
4. Have to, must, need not, cannot and should
5. The present simple and the present continuous (or progressive)
6. The past simple and the past continuous (or progressive)
7. The present perfect simple, the past simple, the present perfect continuous (or progressive), the past perfect simple and the past perfect continuous (or progressive)
8. The "be going to" form, the present continuous and the future simple
9  Irregular verbs

10. Conditional sentences
    and so on.