(2)I doubt if/whether they can swim across the river.
(3)There is no doubt that she will come in time.
(4)I have some doubt whether he will be elected.
2 We started flying around the world and meanwhile,scientists figured out how to split the atom...我们开始坐飞机环游世界,与此同时,科学家们发现了怎样分离原子……
(1)疑问代词who,what,which等和疑问副词when,where,how等后面跟不定式,构成不定式短语,在句中可用作主语、宾语、表语、宾语补足语等成分。
(2)“疑问词+不定式”经常用在某些动词后作宾语,这样的动词(或词组)有:tell,show,know,learn,find out,forget,wonder等。
(3)疑问词why后跟不定式时,省去符号to。
(4)“疑问词+不定式”结构中的不定式要用主动式,不用被动式。
(5)此用法中的不定式的逻辑主语需与主句的主语或宾语保持一致,否则用相应的从句。
I don’t know what to say.我不知道说什么好。
[夯实基础]
(1)He doesn’t know what he will talk about.
He doesn’t know what to talk about.(改为简单句)
(2)I really have no idea whether I will accept her invitation or not.
I really have no idea whether to accept her invitation or not.(改为简单句)
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