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the knife with which we used to cut things is very sharp

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the knife with which we used to cut things is very sharp
1.关系副词相当于介词+关系代词,但是这里本来就应该用关系代词THAT,怎么也改为了介词+关系代词
2.怎么确定关系代词前,相应的介词?请多举例
the knife with which we used to cut things is very sharp
你在背语法做题,没有用英语的思维来考虑问题!
这个句子的意思是:我们用来割东西的那把小刀很锋利.
cut A with B:用B来切割A.
the knife 是主语,
with which we used to cut things是定语从句,其中which不能改成that,因为在定语从句中,介词后面的关系代词只能用which.
is是系动词
very是副词,用来修饰形容词sharp,
sharp是形容词做表语.
具体的介词确定要视所采用的动词而定,范围太广,重点在于平时的积累!这里就不赘述了!