英语语法

1.一般过去时（did):   Last year Jpan experienced 2,125 incidents of school violence
 (通常表示完全发生在过去的事，即现在已经不再那样)

2.一般现在时（do/does):   So far the results are inconclusive
(可以表示现在的状态，也可以表示现在经常性、习惯性发生的事）

3.一般将来时（will+do或am/is/are going to +do):We will have a less civil society

4.过去将来时：（would+do或was/were going to+do):   They gave justices permanent positions so they would be
                                                                                   free to upset those in power
（表示事情发生在过去的将来，通常与一般过去时搭配）

5.过去进行时（was/were+doing):   He was searching for tiny engraved seals

6.现在进行时（am/is/are+doing):Home prices are holding steady in most regions

7.将来进行时（will be doing

8.过去完成时（had +done):He had never gambled before the casino sent him a coupon for $20 worth of gambling.
(表示“站在过去的时间点回头看之前发生的一件事的完成结果”，过去的之前）
(表达的是一个时间段，从“过去的之前”到“过去”）

9.现在完成时（have/has+done):The question of GDP and its usefulness has annoyed policymakers for over
                                                half a century.
(从“现在的之前”到“现在”）

10.将来完成时（will have+done):……relaxation will be in front of smell-television,and digital age will have arrived.

11.现在完成进行时（have/has been+doing):We have been working hard for several months
(相比于现在完成时，其更强调完成的过程性）

12.过去完成进行时（had been+doing)

13.将来完成进行时(will have been+doing)

构成：be+done

被动语态与时态的结合：把be 变成对应的各种时态

被动语态与情态的结合：情态动词+be done