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Whether与If的区别复习知识点精析
版块:教育培训   类型:普通   作者:clcfone   查看:19   回复:0   获赞:0   时间:2022-08-24 14:12:34

Whether与If的区别复习知识点精析
1. 引导主、表、 同时,用whether不用if.
whether it is true remains a problem.               (主语从句 )
The question is whether he will speak at the meeting.  (表语从句 )
I am in doubt whether I should agree to the plan.     (同位语从句)

2. 引导动词的宾语从句时, 既可以whether也可以if
whether引导的宾语从句一般都是肯定句; if引导的宾语从句分可以是肯定句,也可以是否定句 
Could you tell me us whether/if it rains in winter in Australia? (请告诉我冬天澳大利亚是否下雪?) 
I don’t care if it doesn’t rain. (我不在乎是否下雨)
(注意1) 一般的说, whether引导的宾从, 强调正反两个方面的选择意义; 用if引导的宾从, 强调说话者希望得到正面意义或肯定意义的回答. 
I asked the teacher if I could go. 我问了老师,我去行不行.(暗示我想去.) 

I asked the teacher whetherI should go. 我问了老师,我是否也该去.(表示我去不去都可以.)

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(注意2) 引导discuss的宾语从句,用whether不用if
We discussed whether Mary could join us.    (我们讨论了是否玛丽能同我们一起干)

3. whether、 if常和 or not 分开使用, 有时也与or not连用(限whether)。
I don’t know whether they will come or not. (我不知道他们来不来。)
I don’t know whether or not they will come。 (我不知道他们来不来。)
I don’t know if or not they will come。(×)

4. 当whether引导的从句作介词的宾语或置于句首表示强调时,不能if与替换。whether可与不定式连用,if不可。
Everything depends on whether we have enough money. (一切得靠我们是否有足够的钱来决定.) 
I wonder whether to go. 我不知道是否去.
Whether he will come, I am not sure.我不能确定他是否来.

5. 二者还可以引导状语从句, if引导的状语表示条件;whether引导的状语从句,表示让步,译为“不管、无论---”
If we start at six, we’ll be there in time.(如果六点钟出发,我们会即时赶到那儿。)
Whether you go or not, I will。(不管你去不去,我都去。)

6. whether及if均可与or搭配, 构成“whether…or…”与“if…or…”意义为“或---- 或----”、“是----还是----”.
He asked the teacher if/ whether I was going out or staying at home. (他问我是出去还是呆在家里.)

题一: Do you know the speed ____ the car is running?
A. at which      B. which        C. with which    D. that
题二: By n ine o’clock, all the Olympic torch bearers had reached the top of Mount Qomolangma, appeared a rare rainbow soon.
A. which B. on which C. that D. above which
题三: While driving through the city, she showed me the building ____ she once worked as a lift operator.
A. among which      B. which        C. in which     D. that
题四: The sch ools themselves admit that not all children will be successful in the jobs ______ they are being trained.
A. that        B. for which      C. which    D. about which
题五: Life is like a long race _____we compete with others to go beyond ourselves.
A. why          B. what              C. that      D. where
答案
题一: A
详解:____ the car is running是定语从句,其先行词是the speed。定语从句与先行词可连接成the car is running at the speed。at …speed(以……的速度)为固定搭配。 
题二: D
详解:_____appeared a rare rainbow soon是定语从句,其先行词Mount Qomolangma,定语从句与先行词可连成above Mount Qomolangma appeared a rare rainbow soon。rainbow应在山峰的上空,故用介词above。
题三: C
详解:定语从句 she once worked as a lift operator可与先行词the building连成she once worked in the building as a lift operator。
题四: B
详解:定语从句______ they are being trained与先行词the jobs可连成they are being trained for the jobs。train sb. for sth.为固定搭配。
题五: D
详解:_____we compete with others to go beyond ourselves为定语从句,其先行词为race。因为从句缺少地点状语in the race, 故用where。

 
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