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331 doubt—doubtless—doubtful
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doubt可作动词，也可作名词。作动词时它表示“怀疑”，后面可以跟：
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名词或代词：
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I doubt the truth of their report. 我怀疑他们报告的真实性。
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They doubt his honesty. 他们怀疑他不老实。
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I don’t doubt it in the least. 我对此毫不怀疑。
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从句：
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Nobody doubts what he says. 没人怀疑他说的话。
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I don’t doubt that you’re honest. 我不怀疑你是诚实的。
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I doubt whether it is true. 我怀疑这是否是真的。
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He doubted that the new equipment was really necessary. 他怀疑新设备是否真的需要。
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作名词时也表示“怀疑”，多作不可数名词：
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This increased her doubt. 这增加了她的怀疑。
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There is not much doubt about his guilt. 对他的罪行没有多少怀疑。
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He had no doubt on that point. 在这一点上他毫不怀疑。
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在there is (have) no doubt后常可跟that引起的从句：
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There was no doubt that he was a fine scholar. 毫无疑问他是一位优秀的学者。
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I have no doubt that we shall be able to do something for you. 我不怀疑我们能为你做点什么。
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在肯定句中doubt后面可跟whether引起的从句：
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There is some doubt (as to) whether she will come on time. 她是否准时来有点儿让人怀疑。
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有时也可作可数名词：
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A sudden doubt came to her mind. 她脑中突然产生一点儿怀疑。
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She had her doubts whether he would come. 她有点儿疑虑他是否会来。
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no doubt和without (a) doubt都可用作状语，表示“毫无疑问”：
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Mrs. Warren, no doubt, has her merits. 华伦夫人毫无疑问有她的优点。
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