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问题: What most of the parents do is try to help young p

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或to try吗?但是这句话为什么是对的??????????

解答:

首先,这个句子的主语是what most of the parents do,在这里is和try中间的确应该有个to,但当主语中含有do时,这里的to可以省略。

下面这个是从网上找的,你可以看看。
七、主语带do表语省略to的情况
  当主语部分有动词do的某种形式时,用作表语的不定式可以省略to。如:
  All you do now is (to) complete the form. 你现在要做的只是把这张表填好。
  The only thing to do now is (to) go on. 前进是现在唯一的出路。
  What I’ll do is (to) tell her the truth. 我要做的就是告诉她真相。

参考文献:http://www.examda.com/gaokao/fudao/englishi/20080828/08562690-2.html