對(duì)于一些孩子來(lái)說(shuō)，在學(xué)習(xí)英語(yǔ)的過(guò)程中，最難的就是復(fù)雜的時(shí)態(tài)問(wèn)題和一些語(yǔ)法變化規(guī)則，到底什么時(shí)候用he，什么時(shí)候用his，在樹上是“on the tree”還是“in the tree”呢？下面小編整理了一些關(guān)于小學(xué)生的英語(yǔ)語(yǔ)法知識(shí)，供孩子在學(xué)習(xí)過(guò)程中參考！

1）時(shí)態(tài)：可以表示過(guò)去，現(xiàn)在和將來(lái)的情況。它的基本特點(diǎn)是時(shí)態(tài)退后。

a.同現(xiàn)在事實(shí)相反的假設(shè)

句型 ：

條件從句　　　　　主句

一般過(guò)去時(shí) should( would) +動(dòng)詞原形

例句 If they were here， they would help you.

b.表示于過(guò)去事實(shí)相反的假設(shè)

句型：

條件從句 主句

過(guò)去完成時(shí) should(would) have+ 過(guò)去分詞

例句

If she had worked harder， she would have succeeded.

The rice would not have been burnt if you had been more careful.

If my lawyer had been here last Saturday， he would have prevented me from going.

If he had come yesterday， I should / would have told him about it.

含義：He did not come yesterday， so I did not tell him about it.

If he had not been ill and missed many classes， he would have made greater progress.

含義： He was ill and missed many lessons， so he did not make greater progress.

c.表示對(duì)將來(lái)的假想

句型：條件從句 主句

一般過(guò)去時(shí) should+ 動(dòng)詞原形

were+ 不定式 would + 動(dòng)詞原形

should+ 動(dòng)詞原形

例句 should succeed，were to succeed， everything would be all right

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