that引导陈述句if可以引导宾语从句【表是否】和条件状语从句whether引导条件状语从句if whether区别:介词后只能用weather只能whether or not 不能if or not但是可以if ……or notwhether后可接不定式,if不行基本知道这些中考就没问题了

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

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thatthat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) 本回答被网友采纳

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 ?

6.that 更多追问追答 追问 还有几题 就可以采纳 追答 1-5AADCB确定正确 追问 你再看下 可能出错 追答 19.runs as fast as 1-5AADCB 22.have a tour 9.if 3.D 5.B 追问 选择题也要 追答 8.whether 追问 看不清楚吗? 追答 嗯 追问 这个清楚 追答 4C 7.whether 追问 追答 选择题重新拍一下,看着不清楚,晃眼 10.that

一般可以互换,但句中有 or not 或与不定式连用,或放在句首时只能用 whether 本回答由提问者推荐

if 不能用于选择性条件从句,只能用wetherHe don't know wether she want to watch TV or go to the cinema

一、引导宾语从句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、引导主语从句只能用whether,不能用if.It is unknown whether he will come.Whether the news is true remains a question.三、引导表语从句只能用whether,不能用ifThe question is whether they can take our advice.四、引导同位语从句常用whetherThe question whether he'll come is unknown.五、可以用来引导一个否定的宾语从句,whether则不能用来引导否定的宾语从句,因为它表示正反两方面的选择意义比较强.Tell me if it is not going to rain,please.六、if除引导宾语从句外,还可以引导条件状语从句,作“是否”解.在容易引起混淆产生歧义的情况下,就不可用if,而须用whether.Please let me know if you intend to come.这个句子有两种解释:A:“请让我们知道你是否想来.” B:“如果你打算来,请让我们知道.”在书面语中,如果我们想表达的第一种含义,就得用whether来改写第一句.Please let me know whether you intend to come.通俗来讲,whether在大多数情况下都可以用,而if则不然,有wether和if时一般选wether不会有错,但是如果所需的意思是"如果",自然只能选if了

一、引导宾语从句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、引导主语从句只能用whether,不能用if.It is unknown whether he will come.Whether the news is true remains a question.三、引导表语从句只能用whether,不能用ifThe question is whether they can take our advice.四、引导同位语从句常用whetherThe question whether he'll come is unknown.五、可以用来引导一个否定的宾语从句,whether则不能用来引导否定的宾语从句,因为它表示正反两方面的选择意义比较强.Tell me if it is not going to rain,please.六、if除引导宾语从句外,还可以引导条件状语从句,作“是否”解.在容易引起混淆产生歧义的情况下,就不可用if,而须用whether.Please let me know if you intend to come.这个句子有两种解释:A:“请让我们知道你是否想来.” B:“如果你打算来,请让我们知道.”在书面语中,如果我们想表达的第一种含义,就得用whether来改写第一句.Please let me know whether you intend to come.通俗来讲,whether在大多数情况下都可以用,而if则不然,有wether和if时一般选wether不会有错,但是如果所需的意思是"如果",自然只能选if了