Mr. Li said that it was required that Tom (not be l)ate for class.

问题描述:

Mr. Li said that it was required that Tom (not be l)ate for class.
请解释下 not be 还有为什么不能选wasnot

这是require的虚拟语气的用法,require that sb (should) do/be
被动句式也是这样的
否定词放在do之后,be之前