英语时态有哪些特殊的变化形式

时态是英语中谓语动词所表示的动作或情况发生时间的各种形式，是各级各类考试的必考内容。下面，我们来学习英语时态的变化形式，大家可以作为参考。

1、在see to it，make sure，make certain，be sure，look out，take care等之后的从句要用一般现在(过去、现在完成)时代替一般将来(过去将来、将来完成)时。

You must make sure the door is closed before you leave the lab. / See to it that everything is OK.

2、既定的时间如生日、日历、课时安排、交通时刻表等，通常用一般现在时表示将来动作。

The meeting starts at five o'clock. / The train leaves at three this afternoon.

3、在宾语从句中，表示客观事实或真理，一律用一般现在时。

The teacher taught us yesterday that the moon circles the earth. / Somebody told me that you are a writer.

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4、以Here或There开头的句子，说明正在发生的动作，谓语动词不用现在进行时，而用一般现在时。(其实就是倒装句一种)

Here comes the bus! / There goes the bell!

5.在由as soon as，when，before，after，till等引导的时间状语从句和由if，unless，as long as，in case等引导的条件状语从句或在方式、让步状语从句中，常用一般现在时代替将来时，但主句用一般将来时。

If you come this afternoon，We'll have a meeting. / When you meet him，tell him to come to my place.

6、若句中带有always，all the time，forever，constantly等词或短语，用进行时表示一个频繁发生的动作，表示说话人赞赏或厌恶等感情。

You are always forgtting the important things. / He is constantly leaving his things behind.

7、某些词，如come，go，leave，arrive，start等可用现在进行时表示将来。

He is leaving tomorrow. / The visitors are arriving in a few minutes.

8、用表示意愿及精神状态的动词，反映的是说话者探询的态度时，动词用一般过去时表示一般现在时，显得更加有礼貌。

You must make sure the door is closed before you leave the lab. / See to it that everything is OK.

9、在含有hardly/scarcely…when，no sooner…than结构的句子中，主句用过去完成时，从句用一般过去时。(注意：主句一般倒装)

Hardly had I entered the room，when I heard a loud noise. / No sooner had he reached the door than he came back.

10、在wish，would rather的宾语从句中和在as if引导的状语从句中，以及在It is time that…的定语从句中，谓语动词用一般过去时说明现在的事情。如：

It's time you had a holiday. / He looks as if he were young.

11、表示和交待故事发生的背景情况等等。

One day Jones was walking along the street. / It was snowing as they made their way to the front.

12、与always，forever，constantly，continually，frequently等词连用，表示过去经常发生的行为，往往带有感情色彩。如：

My brother was always losing his key. / They were frequently quarrelling.

其实是英语动词的时和体。时有现在、过去、将来和过去将来;体有一般、完成、进行和完成进行。而语态有2种，即主动和被动。以上只是主动，加上被动就更多了。

单词的积累和语法的掌握是学习英语的重中之重，以上就是小编给大家分享的英语语法知识，希望可以给大家在学习过程中带来帮助。