Thw knife___we cut the bread is very sharp.为什么不能用with that?

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Thw knife___we cut the bread is very sharp.为什么不能用with that?

Thw knife_with which__we cut the bread is very sharp
当介词置于关系代词前时,指物只能用which ,指人只能用whom

介词后用which 不用that

that 是同位语 knife指的就是cut the bread的那把knife
如果要加with的话 with后面不能跟that 要跟which