which只能放在主句后面,而as引导的从句位置相对较灵活,可在前,可在后。如:
As he realized,I was very useful to him.
(在前)正像他所意识到的那样,我对他非常有用。
Air,as we know,is a gas.(在中)空气,众所周知,是一种气体。
He was a foreigner,as I know from his accent.
(在后)他是个外国人,正像我从他的口音判断的那样。
He came late again,which made his boss angry.
(在后)他又来晚了,这一点使得老板很生气。
在which引导的定语从句中,谓语动词若是am,is,are,则这些系动词不能省略,而as后面若是这种情况,则可以省略。如:
He is a teacher,as (is)clear from his manner.(is可以省略)他是个老师,这从他的言谈举止可看清楚。
He said he had never seen her before,which was not true.
(was 不可省略)他说他从来没见过她,这一点不对。
当which引导的从句在意义上近乎并列关系时,可以用and this,and that代替,意思是“这件事”。如:
He changed his mind,which (and this,and that)made me very angry.
他改变了主意,这使我很生气。
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