it's time that加should do和加过去式有什么区别?

it's time that加should do和加过去式有什么区别? it is high time that 从句中用过去式和用should+V.有什么区别 It is（high）time that加从句,从句只能用过去式么?还是可以用should+do It is high time that .后面加过去式 还是should加原型? it's the high time did 与should do 有什么区别 It's time to do sth.和 It's time doing sth.有什么区别? it's time to do 和it's time for 有什么区别? It is time that 和it is high time that怎么用什么区别后面加的时态 形式主语加形容词加that后面要用虚拟语气吗.如It's important that sb should do和it' what's加介词和what's that加介词的回答有什么区别 it's time that sb did sth,it's time that sb should do sth有没有 什么动词后面加that...(should) do?