从句遵循的几个原则(从句的三大基本知识)

从句遵循的几个原则(从句的三大基本知识)

首页维修大全综合更新时间:2023-12-24 05:07:14

从句遵循的几个原则

if引导的条件状语从句,意思是”如果“ ,遵循”主将从现“原则,if后面的部分是从句。

从句可放在主句前面,此时要用逗号分开,也可放在主句后面。

如:

1.If it doesn't rain tomorrow , we will go shopping .(if it doesn't rain tomorrow是从句)

= We will go shopping if it doesn't rain tomorrow.

如果明天不下雨,我们就去购物。

2.He will come if you invite him. (if you invite him 是从句)

=If you invite him , he will come .

如果你请他,他会来的。

if引导的从句称之为条件状语从句,在句子中作状语。主句用将来时态,而从句用一般现在时。

扩展资料

if做连词,主要有两个意思,一是“是否”,引导宾语从句,一是“如果”,引导状语从句

一、if作为连词,引导条件状语从句,它表示的意思是“假如”“如果”等.在复合句中如果主句用将 来时,则if引导的状语从句用一般现在时.例如:

1.If itdoesn’train,we will go to the park next Sunday.如果天不下雨,下周星期天我们将去公园.

2.If you ask him,he will help you.如果你求他,

if从句中用过去式,表示不可能实现,大概不会实现或提出作为考虑的假定条件.此时需要用虚拟语气,例如:

1.If you were a bird,you could fly.假使你是只鸟,你便会飞了.

2.If I asked him(if I were to ask him) for a loan,would he agree?如果我向他借贷,他会答应吗?

另外,if从句中用过去完成式,表示过去未实现的条件(例如由于不可能实现或某人之未能实行).例如:

1.If they had startedearlier,they would have arrivedin time.要是他们早些动身,他们便可及时到达了.

2.If they had not started when they did,they would not be here now.如果他们那时不动身,现在他们就不会在此地了.

二、if还可以引导让步状语从句.这时if当作“即使是”,“虽说”解.例如:

1.If she’s poor,at least she’s honest. 虽说她很穷,但至少她还是诚实的.

2.If I am wrong,you are wrong,too. 即使说我错了,那么你也不对.

3.I’ll do it,even if it takes me all the afternoon. 虽然会花费我一下午的时间,我还是要做这事.

三、if作为连词还可以引导宾语从句.引导宾语从句时和whether意思相同.例如:

1.Lily asked if / whether she liked it.莉莉问她是否喜欢它.

2.She asked if / whether they had a cotton one. 她问是否他们有一件棉织的.

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