那什么又是时间/条件状语

那什么又是时间/条件状语

时间状语：

连接时间状语从句的连接词有:

(1) 连词：when, while, as. 它们都表示当…时候的意思。如果主句和从句的动作同时发生且都是进行时　　
　 　态，只用while, as. 其他情况下when, while, as通用。

2) 连词before, after, since, until(till). 当他们表示时间时，他们既是介词又是连词。

(3) 词组：as soon as 通常情况下，主句用一般将来时，as soon as 引导的从句用一般现在时。

条件状语：

条件状语，主要由 if, unless, supposing/suppose, provide, as long as, in case, even if, on condition that, whether……or 引导。当主句是将来时，从句一般用一般现在时
if(如果)
If weather permits,I will go out for a barbecue.
If you say so

What if(如果……又怎么样？)
What if I fail!
What if it's true?

Only if(只有)
Only if you study hard,will you pass the test.

unless(除非)
Unless I am invited ,I won't attend the evening party.

suppose/supposing (假设，假如 两者可以互换)
Supposing that he proposes to you ,will you agree?
Suppose she finds out, what shall we do then?

be supposed to(应该)
They were supposed to be here an hour ago.

provide/providing(条件是)
I will go provided that my expenses are paid
I will wash the dishs,providing you cook the meal.

on condition that(前提是)
I will lend this book to you on condition that you do not lend it to anyone else.

as long as (只要)
I will wait fot you as long as you promise me you will come.

in case(万一)
Close the window in case it rains

even if(即使)
Even if he is a relative of mine, I am going to expose him.

whether……or
Whether young or old ,we should persist in learning.

时间状语从句:表示时间性质的状语从句 例句：It's five years since he smoked他吸烟已经有5年了(since he smoked是时间状语从句) 引导词有：when,as,while,before,after,since,till/until,as soon as,once,whenever,so(as)long as,by the time,each time,every time,immediately等。另外还有：hardly...when,no sooner...than 条件状语从句：表示条件或要求性质的状语从句 例句： 1）I can lend you the bike on condition that you return it on time我可以把自行车借给你，但条件是你必须限期归还(on condition that you return it on time是条件状语从句) 2）You'll fail if you don't work hard如果你不努力就会失败(if you don't work hard是条件状语从句) 引导词有：if,unless,so(as)long as,on condition that(只要）