doubt的用法

二. 用作名词，与用作动词类似。如： I have no doubt that it is true. 我敢肯定这是真的 There is some doubt whether he will come to help us. 他是否会来帮助我们还拿不准。 1.ቤተ መጻሕፍቲ ባይዱdoubt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 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。
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）I doubt that...=I dont believe that...我不相信... 2)I dont doubt that...=I believe that...我相信... 3) I doubt if/whether...我拿不准... 4) Do you doubt that...?=Do you not believe that...?
I doubt if she will change her mind.我拿不准她是否真的会改变 想法。 I doubt that she will change her mind.我不相信她会改变想法。 I doubt if/whether he will win.我拿不准他能否赢。 I don't doubt that he will win.我相信他会赢。 I doubt if [whether] he’ll come. 我拿不准他是否会来。 I don’t doubt that he will succeed. 我相信他会成功。 Do you doubt that he will win? 你不相信他会赢吗?
1)I doubt ____ she will change her mind for she often behaves strangely. a whether b that 2)she's begun to doubt ____she exists. 现在她都开始怀疑自己是否存在了。 a whether b that a 3）I doubt ____she will change her mind because she is a determined girl. a whether b b that