虚拟语气 

1.She would have come if we invited her.这是与过去事实相反的虚拟假设，从句应该用过去完成时。所以在 we 后加 had.

2.My suggestion is that we would send a few people to help them.suggestion 的表语从句也应用虚拟语气，必须用should加动词原形，should可以省略。此处去掉would 或把would 改为should。

3.The secretary wishes that she has time to type the letter now.wish 后的时态应该把真实时态往后推一个时态，所以把has改为had。

4.It’s time that we go to bed.句式为It’s time sb did sth 所以把 go 改为 went。

5.I would rather you have another try tomorrow.词组为would rather sb did sth. 所以把have改为had。