
Modal auxiliary can - could
| Present | Present continuous | Preterite | Preterite continuous | 
| I cannot you cannot he cannot we cannot you cannot they cannot | - | I could not you could not he could not we could not you could not they could not | - | 
| 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 | ||
| - | - |