時(shí)態(tài)是英語(yǔ)中謂語(yǔ)動(dòng)詞所表示的動(dòng)作或情況發(fā)生時(shí)間的各種形式，是各級(jí)各類考試的必考內(nèi)容。下面，我們來(lái)學(xué)習(xí)英語(yǔ)時(shí)態(tài)的變化形式，大家可以作為參考。

1、在see to it，make sure，make certain，be sure，look out，take care等之后的從句要用一般現(xiàn)在(過去、現(xiàn)在完成)時(shí)代替一般將來(lái)(過去將來(lái)、將來(lái)完成)時(shí)。

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

2、既定的時(shí)間如生日、日歷、課時(shí)安排、交通時(shí)刻表等，通常用一般現(xiàn)在時(shí)表示將來(lái)動(dòng)作。

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

3、在賓語(yǔ)從句中，表示客觀事實(shí)或真理，一律用一般現(xiàn)在時(shí)。

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開頭的句子，說明正在發(fā)生的動(dòng)作，謂語(yǔ)動(dòng)詞不用現(xiàn)在進(jìn)行時(shí)，而用一般現(xiàn)在時(shí)。(其實(shí)就是倒裝句一種)

Here comes the bus! / There goes the bell!

5.在由as soon as，when，before，after，till等引導(dǎo)的時(shí)間狀語(yǔ)從句和由if，unless，as long as，in case等引導(dǎo)的條件狀語(yǔ)從句或在方式、讓步狀語(yǔ)從句中，常用一般現(xiàn)在時(shí)代替將來(lái)時(shí)，但主句用一般將來(lái)時(shí)。

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

6、若句中帶有always，all the time，forever，constantly等詞或短語(yǔ)，用進(jìn)行時(shí)表示一個(gè)頻繁發(fā)生的動(dòng)作，表示說話人贊賞或厭惡等感情。

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

7、某些詞，如come，go，leave，arrive，start等可用現(xiàn)在進(jìn)行時(shí)表示將來(lái)。

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

8、用表示意愿及精神狀態(tài)的動(dòng)詞，反映的是說話者探詢的態(tài)度時(shí)，動(dòng)詞用一般過去時(shí)表示一般現(xiàn)在時(shí)，顯得更加有禮貌。

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結(jié)構(gòu)的句子中，主句用過去完成時(shí)，從句用一般過去時(shí)。(注意：主句一般倒裝)

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的賓語(yǔ)從句中和在as if引導(dǎo)的狀語(yǔ)從句中，以及在It is time that…的定語(yǔ)從句中，謂語(yǔ)動(dòng)詞用一般過去時(shí)說明現(xiàn)在的事情。如：

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

11、表示和交待故事發(fā)生的背景情況等等。

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

12、與always，forever，constantly，continually，frequently等詞連用，表示過去經(jīng)常發(fā)生的行為，往往帶有感情色彩。如：

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

其實(shí)是英語(yǔ)動(dòng)詞的時(shí)和體。時(shí)有現(xiàn)在、過去、將來(lái)和過去將來(lái);體有一般、完成、進(jìn)行和完成進(jìn)行。而語(yǔ)態(tài)有2種，即主動(dòng)和被動(dòng)。以上只是主動(dòng)，加上被動(dòng)就更多了。

單詞的積累和語(yǔ)法的掌握是學(xué)習(xí)英語(yǔ)的重中之重，以上就是小編給大家分享的英語(yǔ)語(yǔ)法知識(shí)，希望可以給大家在學(xué)習(xí)過程中帶來(lái)幫助。