This problem is not to be trifled with 这句话为什么要

题目

This problem is not to be trifled with 这句话为什么要
This problem is not to be trifled with 这句话为什么要用不定式

答案

我是加拿大人,前英语老师.
不是这样的.
to 和 接下去的 3 个单词 be trifled with 不可连起来当作不定式去看.
词组
is to
are to
was to
were to
相等于
must ,
也就是说
This problem is not to be trifled with
和
This problem must not be trifled with
是一样的.