Question

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

Answer 1

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.