关于doubt的句子用that还用whether,

关于doubt的句子用that还用whether,
英语人气:434 ℃时间:2019-11-15 06:35:33
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doubt的肯定形式后接whether/if从句,否定和疑问形式后接that从句
I doubt whether/if he can speak English.(肯定句)
I do not doubt that he can speak English.(否定句)
Do you doubt that he can speak English?(疑问句)
而be sure的肯定疑问形式后接that从句,否定形式后接whrther/if形式
I am sure that he can do it well.(肯定句)
Are you sure that he is a teacher?(疑问句)
I am not sure whether/if the news is true.(否定句)
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