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They are known as modal auxiliary verbs because they “help” other verbs.
E.g. You must do it.
I can play tennis.
The prices may rise soon.
A modal verb has the same form in all persons.
E.g. I/ you/ he/ she/ it/ we/ they can swim.
| Positive | Negative | Questions |
| I can come. I could come. I must come. It may rain. You should see this film. | I can’t (cannot) come. I couldn’t (could not) come. I mustn’t (must not) come. Youmay not park here. You shouldn’t (should not) see this film. | Can I come? Could I come? Must I come? May I go home? ShouldI see this film? |
Modal auxiliary verbs have no infinitives or participles, “must” doesn’t have a past form, “could” is used with a past meaning only in some cases. Instead we use other expressions:
Must have to…
Can/ could be able to…
1. Can – could – be able to…
We use “can (present) / could (past) ” to say that something is possible or that someone has the ability to do something.
E.g. I can speak three foreign languages.
I’m afraid I can’t help you with this work.
When I was young I could swim very fast.
Be able to is sometimes possible and sometimes necessary instead of can / could. Study how they are used in the present, past and future.
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