共有十六种时态。 

Past

Present

Future

Past future

Simple

I studied English.

I study English .

I will study English .

I would study English .

Continuous

I was studying English .

I am studying English .

I will be studying English .

I would be studying English .

Perfect

I had studied English .

I have studied English .

I will have studied English . (by ---year)

I would have studied English .

Perfect continuous

I had been studying English. (for --years)

I have been studying English . (for --years)

I will have been studying English . (for--years)

I would have been studying English .

详解：

1.一般现在时：动词用一般形式，第三人称单数后要加-s或-es。                                             (simple present ) 2.现在完成时：have + done (第三人称后用has + done)                                                          (present perfect) 3.现在进行时: be (am, is, are) + doing                                                                                  (present continuous) 4.现在完成进行时: have been doing                                                                                 (present perfect continuous) 5.一般过去时: 动词用过去形式                                                                                             (simple past  ) 6.过去完成时：had + done                                                                                                   (past perfect) 7.过去进行时: was/were doing