doubt的用法是什么？

doubt的用法是什么？

doubt是个常用词，也是历年高考经常考查的词语之一。doubt既可用作动词，也可用作名词。现将其用法归纳如下。一、doubt用作动词1. doubt+名词或代词。例如：I doubt his word.我怀疑他的话。They doubted him before.他们以前曾经怀疑过他。2. doubt+宾语从句（1）在否定句和疑问句中，doubt后面接that引导的宾语从句。例如：I don”t doubt that he can finishthe task on time. 我相信他能按时完成任务。Do you doubt that she willsucceed? 你怀疑她会成功吗？（2）在肯定句中，doubt后面一般接whether或if引导的宾语从句。例如：I doubt whether they can swimacross the river. 我怀疑他们能否游过河去。He doubts if she will keep herword. 他不敢肯定她是否会遵守诺言。注意：在肯定句中，doubt后面也可以接that引导的宾语从句，但表示疑虑较大或“不相信”。例如：We doubt that they can completethe work ahead of time. 我们不相信他们能提前完成这项工作。I doubt that he will come.我看他未必会来。二、doubt用作名词1. doubt常与about/of/as to/on等介词连用。例如：There is no doubt aboutit. 此事无可怀疑。I have no doubt of hisability. 对于他的能力我毫不怀疑。She has her doubts as to thisbeing true. 她怀疑这事是否真实。No one has any doubt on thispoint. 这一点没有人会怀疑。2. doubt后面接同位语从句（1）doubt用在否定句中，后面接that引导的同位语从句。例如：I have no doubt that he willsucceed. 我相信他会成功的。There is no doubt that they willagree with you on this matter. 毫无疑问，他们在这件事上会同意你的意见的。（2）doubt用在肯定句中，后面接whether引导的同位语从句。注意不可以用if替换whether。例如：He had his doubts whether theywould give him another chance to have a try. 他不能肯定他们是否会再给他一次机会试一试。There is some doubt whether theirfootball team will win the match. 他们的足球队会不会赢得这场比赛还不能肯定。3. 由doubt组成的一些短语（1）indoubt怀疑；拿不定主意。例如：We are in doubt(about) what to donext. 我们不知道下一步要做什么。When in doubt about the meaningof a word, consult the dictionary. 当你对一个词的意义没有把握时，就查一下词典。（2）no/without/beyond doubt无疑地；必定；当然。例如：It is no doubt difficult.这无疑是困难的。No doubt he didn”t mean to hurtyou. 他肯定不是有意伤害你的。Without doubt this is thebest. 无可置疑，这是最好的。Beyond doubt he will give yousome advice on your study. 毫无疑问，他会给你的学习作一些指导的。（3）makeno doubt of 对……毫不怀疑。例如：We make no doubt of hissincerity. 我们对他的诚意毫不怀疑。She made no doubt of what he hadsaid. 她对他所说的话毫不怀疑。（4）throw/cast doubt on使人对……产生怀疑。例如：Galileo”s experiments threwdoubt on Aristotle”s theory of falling objects. 伽利略的实验使人们对亚里士多德的落体理论产生了怀疑。What he had done cast doubt onhis honesty. 他的所作所为使人们对他的诚实产生了怀疑。

1 doubt的用法
解答： 1，doubt当动词时,在<肯定句>中后面可接if或whether。
在否定句及疑问句中可跟that从句。有时在<肯定句>中也能跟that从句,但其含义是"恐怕...不会"。
I doubt if (或 whether) he will win.
我怀疑他能否赢。
I don''t doubt that he will win.
我毫不怀疑他会成功。
Do you doubt that he will win?
你怀疑他会成功吗?
I doubt that he will win.
恐怕他赢不了。
2，doubt of
对...抱怀疑或悲观态度。
The project began badly and we doubt of its further progress.
这项工程开始就不顺利,我们怀疑能否继续进行。
3，no doubt后接that从句或介词of。
We have no doubt that you will succeed.
We have no doubt of your success.
我们毫不怀疑你会成功。
There is (It is 误) no doubt that you will succeed.
毫无疑问你会成功。

doubt: [ daut ] n. 怀疑,疑惑
v. 怀疑,不信
[ 名词doubter ]
[ 过去式doubted 过去分词doubted 现在分词doubting 第三人称单数doubts ]
例句与用法
1. There is no doubt that we will be successful.
毫无疑问我们会成功的。 2. I doubt the truth of it.
我怀疑此事的真实程度。 3. He was troubled by religious doubt.
他因对宗教的疑惧而十分烦恼。 4. No doubt he means to help, but in fact he just gets in the way.
他确实是想帮忙，然而事实上却只是帮倒忙。 5. She was beyond all doubt the finest ballerina of her day.
她无疑是她那个时代最优秀的芭蕾舞演员。