⑴as引导限制性定语从句,多与the same,as,such,so等连用,可以作主语、宾语或表语;
注意:
①the same … as (定语从句)
②the same … that (状语从句)
⑵as引导非限制性定语从句,可置于句首、句中,意为“正如...”;
⑶as常用于习惯用语中:
①as is often the case情况常常如此,正如往常那样;
②as sb. can see 正如某人所能看到的那样;
③as is well-known to sb.众所周知... (定语从句)
=It is well-known that... (主语从句)
=What is well-known to sb. is that...(主语从句、表语从句)
④as is mentioned above...正如上面提到的...
⑷as在定语从句中作主语时,其后常用be known(expected, announced, reported, shown)等被动结构;
⑸which引导非限制性定语从句,只用于句中,且多意为“这一点”;
⑹当非限制性定语从句是“否定句”或“表示否定意义”时,关系代词用which;
⑺as/which引导非限制性定语从句,均不可省略;两者均可以替代“主句的整个内容”或“主句的一部分”;
⑻which可以作介词的宾语,指代"事物";as不可以置于介词之后作宾语;
【本题答案是as,参照上面的as意为“正如...”;句意:正如专家在演讲中所指出的一样,英语学习不仅仅是记单词。】
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