if 引导的条件状语从句时态(条件状语从句时态)

时间:2023-08-15 13:09:07

条目状语从句时态依据主句定夺。主句是普通异日时态,祈使句或情态动词,从句要用如今时态;主句如果是以前的某种时态,则从句要用以前的某种时态。

条目状语经常使用的开导词是if和unless

1、用if启发:if意为“假如”。

例句:I don’t know if it will rain tomorrow. But if it rains tomorrow, I’ll stay at home.不知道翌日能否会下雨,但倘使下雨的话,我就呆在家里。

2、用unless启发:unless的意思是“假如不”“除非”。

但除了这两个之外,条目状语从句也含有部分其他的向导词,这些向导词呈现频次较低,用法偏庞杂,因此不如if和unless知名度那么高。

1. on condition(that)...在……条件下

eg.I can tell you the truth on condition that you promise to keep a secret.You can eat ice cream on condition (that) you won't eat too much.

2. supposing conj.假如,假若

eg.Supposing it rains,shall we continue the sports meeting?Supposing anything should go wrong,what would you do then?

3. provided conj.借使,除非,以……为前提 provided (that) +从句示意一种假如前提。

eg. He will sign the contract provided we offer more favorable terms.He won't be against us in the meeting provided that we ask for his advice in advance.

4.but for 若非,要不是

eg.But for the rain,we should have a pleasant journey.But for your help,we should not have finished in time.

5. in case 若是,万一

eg.In case I forget, please remind me about it.

6. as/so long as 只有

eg.As long as you’re happy,it doesn’t matter what you do.As long as it doesn't rain, we can go.

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