常见的这类结构有:as has been said before, as has been mentioned above, as can be imagined, as is known to all, as has been announced, as can be seen from these figures, as might/could be expected, as is often the case, as has been pointed out, as often happens, as will be shown等。
4.关系代词that与which用于引导定语从句的区别
如果关系代词在从句中做宾语,用that, which都可以,而且可以省略;
先行词是不定代词anything, nothing, little, all, everything时,关系代词用that;
先行词由形容词最高级或序数词修饰或由next,last, only, very修饰时,用that;
非限定性定语从句只能用which引导;
关系代词前面如果有介词,只能用which。
5.but做关系代词,用于否定句,相当于whonot, thatnot 这个结构的特点是主句中常有否定词或含有否定意义的词。如:
There are few teachers but know how to use a computer. There is no complicated problem but can be solved by a computer.
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