有关表示建议的虚拟语气

Question

有关表示建议的虚拟语气we all agree to the suggestion that the meeting should be put off.如果agree 的形式是agreed一般过去式，那that从句要改变吗，怎么变

Answer 1

不需要变，这种词是modal word，语气词，本来就是某些词的过去式形式。
should本身就是shall的过去式
类似的还有
may might
can could
will would