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问题: 英语问题

What most of the parents do is try to help young plants grow by pulling them upward.这个句子中的主语不是try to help young plants grow by pulling them upward吗,那么try不应该改成trying吗?但是这句话为什么是对的??????????

解答:

本來是What most of the parents do is(to) try to help young plants grow by pulling them upward.的 “to"可以省略掉