本文目录
同位语从句that和 whether的区别
一般不能同时连着用,但是分开可以
英语学习:thatif和whether 引导的宾语从句 要有例句 各位了
1、that引导的宾语从句
可跟that从句做宾语的动词有:say, think, insist, wish, hope, demand, imagine, wonder, know, suppose, see, believe, agree, admit, deny, expect, explain, order, command, feel, dream, suggest, hear, mean, notice, prefer, request, require, propose, declare, report等。
that不可省略的情况:
(1)当句中的动词后接多于两个由that引导的宾语从句时,第一个that可省,但后面的that不可省。
例句:He said (that) you were too young to understand the matter and that he was asked not to tell you.他说你太年轻了,所以他才没告诉你这件事。
(2)当主句的谓语动词与that宾语从句之间有插入语时,that一般不可省。
例句:Just then I noticed, for the first time, that our master was wearing his fine green coat and his black silk cap.就在这时,我第一次注意到我们的老师穿着他那件漂亮的绿外套和黑丝帽。
(3)当that从句是双宾语中的直接宾语时,that不可省。
例句:I can’t tell him that his mother died.我不能告诉他他的目前死了。
(3)许多带复合宾语的句子,that引导的宾语从句经常移到句子后部,而用it作形式宾语。
例句:I find it necessary that we should do the homework on time.及时做作业是必要的。
2、if和whether引导的宾语从句用法大致相同。
(1)if或whether不能和that 或其它连词、副词、同时使用,也不能省去。
例如:I don’t know if(whether) he will come here today .我不知道他今天是否会来。
(2)if或whether引导的宾语从句时,虽具有疑问意义,从句语序应用陈述句语序。
例如:The old woman asked me .if (whether) I knew the way to the hospital .老妇人问我是否知道去医院的路。
(3)if或whether引导的宾语从句应和主句的时态保持一致。即主句为一般现在时,从句用任一种时态,主句为一般过去时,从句则用过去时中的任一种时态。
例如:I don’t know if (whether) he has come here . 我不知道他是否来过这儿。
扩展资料:
if和whether的区别:
1、 在动词不定式之前只能用whether 。
例如:I can’t decide whether to stay. 我不能决定是否留下。
2、 在whether,or not 的固定搭配中。
例如: I want to know whether it’s good news or not . 我想知道是否是好消息。
3、 在介词后只能用whether。
例如:His father is worried about whether he lose his work . 他的父亲担心是否会失去工作。
4、宾语从句放在句首表示强调时只能用whether 。
例如:Whether they can finish the work on time is still a problem . 他们是否能准时完成这项工作还是个问题。
参考资料:
百度百科-if
百度百科-that
百度百科-whether
英语大神怎么说
不能保证100%正确
The other day, my friend and I were walking to a bookshop happily. We saw an old man who was about in his (eighties). He was about to fall down on the side slowly. He went on foot with two (walking) sticks. We ran to ask him (whether) he needed any help. He replied that he needed it (as a matter of fact) because he was really tired. His daughter will come to (pick him up) in a few minutes (and?) he was waiting for her. (Supported) by us, he could stand (on) his own feet. We found a chair for him (so) that he could sit and have a rest. It was cold so I asked him to put on my coat. We waited with him until his daughter arrived. He was (grateful) to both of us.
宾语从句什么时候用if
一、if或whether引导宾语从句时,作“是否”讲常放在动词 ask 、see 、say 、know 和 find out 等后面。一般情况下,两者常可换用,在口语中多用if。
例如:
Nobody knows whether (if) it will rain tomorrow. 没有人知道明天是否下雨。
Lucy asked whether (if) they had a cotton sweater. 露西问他们是否有棉制的羊毛衣。
二、if或whether引导宾语从句时,要注意三个方面,即连词、语序和时态。
1、if或whether不能和that 或其它连词副词同时使用也不能省去。
例如:
我不知道他今天是否会来。
[误] I don’t know that if(whether) he will come here today .
[正] I don’t know if(whether) he will come here today .
他走过来看看猫是否出了毛病。
[误] He came to see what if (whether) there was wrong with his cat .
[正] He came to see if (whether) there was wrong with his cat .
2、 if或whether引导的宾语从句时虽具有疑问意义但从句语序应用陈述句语序。
例如:
Did you know the way to the hospital ? The old woman asked me .
The old woman asked me .if (whether) I knew the way to the hospital .老妇人问我是否知道去医院的路。
3、 if或whether引导的宾语从句应和主句的时态保持一致。即主句为一般现在时,从句用任一种时态主句为一般过去时从句则用过去时中的任一种时态。
例如:
I don’t know if (whether) he has come here . 我不知道他是否来过这儿。
Tom asked if (whether) I had read the book . 汤姆问我是否看过这本书。
三、if和whether的区别
1、 在动词不定式之前只能用whether 。
例如:
I can’t decide whether to stay. 我不能决定是否留下。
2、 在whether „„or not 的固定搭配中。
例如:
I want to know whether it’s good news or not . 我想知道是否是好消息。
3、 在介词后只能用whether。
例如:
His father is worried about whether he lose his work . 他的父
亲担心是否会失去工作。
4、宾语从句放在句首表示强调时只能用whether 。
例如:
Whether they can finish the work on time is still a problem .
他们是否能准时完成这项工作还是个问题。
5、用if会引起歧义时只用whether。
例如:
Could you tell me if you know the answer ?
这句话有两种意思“你能告诉我是否知道答案吗”或“如果你知道答案请告诉我好吗”。如用whether可避免歧义。
扩展资料
宾语从句特点:
1、宾语从句可以作及物动词、介词及形容词的宾语。
2、宾语从句的语序一律用陈述句语序。
3、连接词that引导宾语从句在句中无词义,不充当句子成分,多数情况下可以省略。
4、whether 和 if 都可引导宾语从句,但 whether后可紧跟or not;whether从句可作介词的宾语。
5、如果从句太长,可以用形式宾语it.
补充:
宾语从句在句子中起宾语作用的从句叫做宾语从句.
宾语从句分为三类:
(1)动词的宾语从句,介词的宾语从句和形容词的宾语从句.时态:1·主句用一般现在时,从句可用任意时。 2·主句用过去时,从句用过去某个时态。 3·主句用过去时,从句是真理时,只用一般现在时。
(2)宾语从句的从属连词主要有that,if,whether.that引导表示陈述句的宾语从句,而if和whether引导表示“是否”的宾语从句.
(3)动词的宾语从句大多数动词都可以带宾语从句
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