doubt使用.pptVIP

Doubt 的使用 区别whether 和that * * 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 finish the task on time. 我相信他能按时完成任务。 Do you doubt that she will succeed? 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 swim across the river. 我怀疑他们能否游过河去。 He doubts if|whether she will keep her word. 他不敢肯定她是否会遵守诺言。 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 about it. 此事无可怀疑。 I have no doubt of his ability. 对于他的能力我毫不怀疑。 She has her doubts as to this being true. 她怀疑这事是否真实。 No one has any doubt on this point. 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 will succeed. 我相信他会成功的。 There is no doubt that they will agree 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 they would 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 their football 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。