保护动物的英语作文

1)was / were + to have done sth,例如：

We were to have come yesterday, but we couldn’t.

2)intended (expected, hope, meant, planned, supposed, wished, wanted, desired) + to have done sth,例如：

I meant to have told you about it, but I forgot to do so.

(3)过去完成时常用于以下固定句型：

1)hardly, scarcely, barely + 过去完成时+ when + 过去时。例如：

Hardly had I got on the bus when it started to move.

2)no sooner +过去完成时+ than +过去时。例如：

No sooner had I gone out than he came to see me.

3)by (the end of ) +过去时间，主句中谓语动词用过去完成时。例如：

The experiment had been finished by 4 o’clock yesterday afternoon.

3.将来完成时

将来完成时表示在将来某一时刻将完成或在另一个未来的动作发生之前已经完成的动作；也可以用来表示一种猜测。常与将来完成时连用的时间状语有：by (the time / the end of ) +表示将来时间的短语和句子；before (the end of ) +表示将来时间的词语或句子；when, after等加上表示将来动作的句子等。例如：

1)By this time tomorrow you will have arrived in Shanghai.

2)I shall have finished this composition before 9 o’clock.

3)When we get on the railway station, the train will probably have left.

4.完成进行时

完成进行时是完成时的强调形式，有现在完成进行时，过去

完成进行时，将来完成进行时。

(1)现在完成进行时表示过去某一时刻之前开始的动作或状态一直延续到过去某一时刻。例如：

I have been looking for my lost book for three days, but I still haven’t found it.

(2)过去完成进行时表示过去某一时刻之前开始的动作或状态一直延续到过去某一时刻。例如：

It had been raining cats and dogs for over a week and the downpour had caused landslides in many places.

(3)将来完成进行时表示在将来某一时刻之前开始的一个动作或状态一直延续到将来某一时刻。例如：

By the time you arrive tonight, she will have been typing for hours.

四：时态一致

时态一致是英语四、六级考试的一个重要内容。通常应由主

句谓语的时态决定从句的谓语时态。一般原则是：

1、当主句谓语使用现在时或将来时，从句的谓语根据具体情况使用任何时态

He says that he lives in Wuhan.

We hope that there will be many people at your party today.

―Did you hear that Bill finally sold the house?‖ ―Yes, but I don’t know who bought it.‖

―There’s a lot of excitement on the street.‖

―There certainly is. Do you suppose the astronauts have returned?‖

2、当主句谓语使用过去时的时候，从句的谓语必须使用过去范围的时态

He said he was writing a novel.