to change your diet
这个由to构成的结构叫不定式,不定式在这里起的是名词性质的用法,你把（to change your diet )当成一个整体来看.
这个句子的结构是：
( The first thing ) + ( you need ) + ( is ) + ( to change your diet )
主语 定语 谓语 表语
The first thing you need to do is (to) change your diet.这个句子
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