把两个句子改写成一个定语从句.顺序是什么?

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.还是.The knife is very sharp that I use it to cut many things .重点是怎么改写,以及原因.请不要嫌烦,帮个忙.说得好的,