把兩個(gè)句子改寫成一個(gè)定語從句.順序是什么?

The food tasted bad.We had it in the restaurant on the corner.
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2.The knife is very sharp.I use it to cut many things.
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3.My younger brother is a lovely boy.I often buy some small gifts for him.
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2 是The knife that  I use it to cut many things is very sharp.還是.The knife is very sharp that I use it to cut many things .重點(diǎn)是怎么改寫,以及原因.請不要嫌煩,幫個(gè)忙.說得好的,