if句型的用法總結(jié)（if的用法）

關(guān)于if句型的用法總結(jié)，if的用法這個問題很多朋友還不知道，今天小六來為大家解答以上的問題，現(xiàn)在讓我們一起來看看吧！

1、1.?(表示條件)如果?,主句用將來時，if從句用現(xiàn)在時表示將來He?will?come?if?you?invite?him.?如果你請他,他會來的。

2、?2.?(表示虛擬)假如,要是?1）時態(tài)：可以表示過去，現(xiàn)在和將來的情況。

3、它的基本特點(diǎn)是時態(tài)退后。

4、a.?同現(xiàn)在事實(shí)相反的假設(shè)。

5、句型?：?條件從句?主句?一般過去時?should(?would)?+動詞原形If?they?were?here,?they?would?help?you.b.?表示于過去事實(shí)相反的假設(shè)。

6、句型：?條件從句?主句?過去完成時?should(would)?have+?過去分詞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.?表示對將來的假想句型：?條件從句?主句一般過去時?should+?動詞原形were+?不定式?would?+?動詞原形should+?動詞原形If?you?succeeded,?everything?would?be?all?right.If?you?should?succeed,?everything?would?be?all?right.If?you?were?to?succeed,?everything?would?be?all?right.3.?是否?=?whether?連接賓語從句I?wonder?if?she?is?ill.?不知她是否病了。

7、如果，假如的意思假如，，，，假設(shè)句中使用。

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