
Modal auxiliary can - could
| Present | Present continuous | Preterite | Preterite continuous | 
| can I? can you? can he? can we? can you? can they? | - | could I? could you? could he? could we? could you? could they? | - | 
| Present perfect | Present perfect continuous | Pluperfect | Pluperfect continuous | 
| - | - | - | - | 
| Future | Future continuous | Future perfect | Future perfect continuous | 
| - | - | - | - | 
| Present | Present continuous | Past | Past continuous | 
| - | - | - | - | 
| Infinitive | Imperative | 
| Infinitive | Imperative | ||
| - | - | 
| Present | Past | ||
| - | - |