题目内容：

He went to the market (to) buy some vegetables.
The government warned some factories not (to)pollution the water again.为什么这两处用to?

优质解答

He went to the market (to) buy some vegetables.这个to是不定式作状语,表示目的,为了.The government warned some factories not (to)pollute the water again.这个to是用在warn sb （to） do sth 做宾补 警告某人...