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
一、引导宾语从句(if和whether区别)
这时两者的含义区别很小,一般可通用。
I don't know whether/if they will come to help us.
但是,当whether与or not连成一个词组时,whether不可换用if。
I don't know whether or not they will come for our help.
若whether和or not不连在一起,在口语中可以用if取代whether,当然也可以用whether。
I don't care if/whether your car breaks down or not. 我不在乎您的车是否是会出故障。
此外,还有三种情况值得注意:
(1)在介词后面只能用whether,不能用if。
I am not interested in whether you'll come or not.
(2)在动词不定式之前,只能用whether,不能用if。
He doesn't know whether to stay or not.
(3)在及物运动discuss后的宾语从句中,只能用whether,不能用if。
We discussed whether we should make a change in our plan.
二、引导宾语从句的that
that一般接在一个动词后面,并且引导一个完整的句子.也就是that引导一个做宾语成分的句子.(宾语从句的特征是that可以去掉)例如:I konw(that) she is my step mother.我知道她是我的继母.(that可以省略 ,she is my step mother做konw的宾语)
He says that he is a student.
Can you tell me if / whether he will come tomorrow ?
Can you tell me whether he is right or not ?