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①It is a fact that English has become an international language.
②The big surprise of the evening was when I was elected prom queen!
③It never occurred to me that you could succeed in persuading him to change his mind.
④What some people regard as a drawback is seen as a plus by many others.
⑤It's wellknown that Americans are competitive.
⑥That she has became an artist may have been due to her father's influence.
⑦Whether we should go there remains unknown.
⑧The fact is that more people live in the area.
⑨He looked as though he was ill.
⑩The book is where I put it yesterday.
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(1)以上句中句②、⑧、⑨、⑩句中黑体部分均为表语从句，而句①、③、④、⑤、⑥、⑦句中黑体部分则为主语从句。
(2)由句④和句⑥知，引导主语从句时，what要在从句中充当句子成分，而that不作任何成分，只在语法上起连接作用。句⑦中的whether不作成分，但有意义，表示“是否”。
(3)句①、③、⑤中，it用作形式主语，代替that引导的主语从句。
(4)句②、⑩中的引导词when，where是副词，在从句中作状语，分别表示时间、地点。
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