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。
She has married again,which (and this,and that)was unexpected.
出乎意料的是,她又结婚了。
而as主要起与上下文连接的作用,表达说话人的看法、观点,并指出主句内容的出处或根据等。如:
Einstein,as we know,is a famous scientist.爱因斯坦,众所周知,是位伟大的科学家。
As is announced in today’s newspaper,we must improve our style of work.
今天的报纸上说,我们必须改进工作作风。
作主语时,which既可以作系动词be的主语,也可以作实义动词的主语,而as只可以作系动词be的主语。如:
He married her,which was natural.
(可用as代替which)他和她结婚,这是很自然的事。
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