Suggested answer for Exercise 4
| Verb | Tense | Aspect | Person & number |
Voice | Form |
| see | past | perfect | 3Sg | passive | (it) had been seen |
| saw | present | progressive | 1Pl | active | (we) are sawing |
| bring | future | perfect | 2Sg | passive | (you) will have been brought |
| come | present | perfect | 3Pl | active | (they) have come |
| think | past | progressive | 2Sg | active | (you) were thinking |
| sing | future | perfect | 3Sg | passive | (it) will have been sung |
| read | present | progressive | 3Pl | passive | (they) are being read |
| write | past | perfect | 3Sg | passive | (it) had been written |
| eat | future | progressive | 1Sg | active | (I) will be eating |
| fall | past | perfect | 3Sg | passive | (it) had been fallen |
| buy | present | perfect | 2Sg | active | (you) have bought |
| tell | past | progressive | 3Pl | passive | (they) were being told |
| pull | future | progressive | 2Pl | active | (you) will be pulling |
| go | past | perfect | 3Sg | active | (he) had gone |
| send | future | perfect | 3Pl | passive | (they) will have been sent |