Can
Can is an auxiliary verb, a modal auxiliary verb. We use can to:
- talk about possibility and ability
- make requests
- ask for or give permission
Structure of Can
subject + can + main verb
The main verb is always the bare infinitive (infinitive without "to").
| subject | auxiliary verb | main verb | ||
| + | I | can | play | tennis. |
| - | He | cannot | play | tennis. |
| can't | ||||
| ? | Can | you | play | tennis? |
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