英语常见的特殊时态表达现象是是什么

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.

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。

所有人都明白动词的形式决定句式的时态，充分的体现英语时态语态和动作的紧密联系。掌握好动词各种时态才算掌握英语语法大的框架。