(1)连词that(无词意), whether(是否), 在从句中不担任句子成分, 只起连接作用; whether能引导主语从句, 而if不能。
That you don’t like him has nothing to do with me.
Whether John will do this experiment remains a question.
(2)疑问代词who, what, which, 在从句中既作连接词又充当主语、宾语、表语、定语等。
Who will be sent abroad to further his studies is not announced. w*w*w*k*s*5*u*c*o*m
What surprised me most was that such a little girl could play the violin so well.
Whichever you take will be yours. Whoever wants this book may take it.
(3)疑问副词when, where, how, why在从句中充当时间、地点、方式和原因状语。
Where the heroine went is not mentioned at the end of the story.
How he managed to finish the composition in such a short time is still a mystery.
(4)用it作形式主语的主语从句常用的句型
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