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as在定语从句中做主语时.从句位于通常要有be或别的系动词,但which不受限制.谁可以举几个例子

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as在定语从句中做主语时.从句位于通常要有be或别的系动词,但which不受限制.谁可以举几个例子
as做主语时后常有be ,但是which是绝对不可以的.which后可以是肯定句也可是否定句,但as后只能是肯定句.这两种情况见下例.
as is known to us all,the earth is round.
as is the case,he is always the last to arrive.
he came late again,which didn't surprise us .
he passed the exam ,which made his parents happy.
再问: LiMing was late,which made MrZang very angry 中的which可以as替换么?》
再答: 不可以,因为which 表因果关系。而as 表事实的依据。
再问: He married her ,which is unexpected 中的which呢?可以用as换么?》