Question

三道英语题

1.--Hello. Can I speak to Mr.brown?
--I'm sorry,but it is 3 weeks ____ he worked here.
A.before B.since C.after D.while
2.I'd like ___ the games with you ,but I had extra work to do.
A.to enjoy B.to be enjoyed C.to have enjoyed D.to have been enjoyed
3. By the time Pierce comes back from the metting, we ___here for three hours.
A.will be waiting B.is waiting C.will wait D.will have wait.
以上三题的答案分别是B,C, 请给出详解 谢谢了！~

Answer 1

1. 若since引导的状语从句的谓语动词是终止性的过去时，则从句表示的时间是“从动作开始的那一时刻起”。如：
He has studied very hard since he came to our school.自从他来到我们学校，他学习就非常努力。
We have been missing them since they left here自从他们离开这里，我们就一直很想念他们。
这是最常见的一种用法，此处不再多述。
二、若since引导的状语从句的谓语动词是持续性动词或表示状态的动词的过去时时，则从句表示的时间是“从那持续动作或状态结束时算起”。如：
I haven’t heard any noise since I slept. Sleep 为持续性动词，sleep的动作结束时，即“醒来”时，这句应译为“我醒后还未听到任何声音”。
John is now with his parents in New York, it is already three years since he was a teacher约翰现在和父母一起住在纽约，他不当教师已经三年了。

2. 容易错选A 注意后面是 had 而不是 have 说明这是在对过去情况作说明。
这里是虚拟语气。 对过去的虚拟 通用句型 sb had done ..... would have done ......
eg the plants would have died in case that the rain had not come.
3.高中阶段 看见 by the time 就选 完成时 这里是将来完成时 D

Answer 2

1.--Hello. Can I speak to Mr.brown?
--I'm sorry,but it is 3 weeks __b__ he worked here.
A.before B.since C.after D.while
since从句是延续性动词，表示从动作结束时算起，所以先since，意思是“他有三周不在这工作了”
2.I'd like _c__ the games with you ,but I had extra work to do.
A.to enjoy B.to be enjoyed C.to have enjoyed D.to have been enjoyed
would like to do表示现在或将来愿意做，与现在或将来的时间状语连用。而would like to have done表示过去愿意做但没做。与过去的时间状语连用。从后一句可看出是过去。
3. By the time Pierce comes back from the metting, we _d__here for three hours.
A.will be waiting B.is waiting C.will wait D.will have wait.
By the time 后面的主句要用一种完成时，从句用一般现在时显然是为了表示将来。所以后面要用将来完成时。