时态(tense)
时态中的"时"即时间，可分为现在时、过去时、将来时和过去将来时；"态"即形态、形式，可分为一般式、进行式、完成式和完成进行式。所以，动词一共有16种时态。
| 一般 | 进行 | 完成 | 完成进行 | |
|---|---|---|---|---|
| 现在 | work、works,一般现在时 |
am、is、are working,现在进行时 |
has、have worked,现在完成时 |
has,have been working,现在完成进行时 |
| 过去 | worked,一般过去时 |
was、were working,过去进行时 |
had worked,过去完成时 |
hed been working,过去完成进行时 |
| 将来 | will work,一般将来时 |
will be working,将来进行时 |
will、shall have worked,将来完成时 |
will have been working,将来完成进行时 |
| 过去将来 | would、should work,过去将来时 |
would、should be working,过去将来进行时 |
would、should have worked,过去将来完成时 |
would、should have been working,过去将来完成进行时 |