To be convincing: to provide powerful support for a belief and to overcome doubts.
I told her to leave us alone and not to interfere in our problems.
以上两句,两个不定式虽然是并列关系,但在这个并列关系前提下,又存在其他关系:句1,第二个不定式是前面不定式的目的或结果;句2,第二个不定式与前面不定式在结构上对立(肯定---否定),在意思上是前一个的目的。
所以,在这种情况下,不定式原则不要省略 to。如果两个不定式纯属并列,没有其他关系,则省略to:
The teacehr asked her to read and wirte English every day.
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