B.在表示建议、命令、要求以及表示“重要性”和“紧迫性”等含义的主语从句、宾语从句、表语从句和同位语从句中，谓语动词常用虚拟语气，由“动词原形”或“should + 动词原形”构成。 should常常省略
I would recommend that you _______(think) about doing something similar for yourself. (should) think
It was imperative that students ______(finish) their papers before July 1st.
(should) finish
C.动词wish 、would rather (sooner)、if only、as if后的虚拟语气。
I would rather he _____(buy) the house next year.
bought ( 表示从句中动作尚未发生)
She treats me as if I ______ (be) a stranger. were
The manager told us to be friendly to the visitors as if we _____( meet) them before.
had met
If only we ______(have) a phone！ I‘m tired of waiting outside the public phone box.
D.in case ， for fear that ， lest等词后从句的谓语动词为(should) + 原形。
He took his umbrella with him lest it _______ (rain.)
(should) rain
E.在It is (high) time that从句中谓语动词一般用过去时动词。
It‘s high time that we _______(take) firm measures to protect our environment. took
F.时间错综条件句，动词的形式要根据表示的时间调整。
如果我们早动身，现在就不会在雨中走了。
If we had set out earlier，we wouldn‘t be walking in the rain.
(从句中动作发生在过去，主句中动作发生在现在。)
4)动词的非谓语动词形式：
A.动词不定式：主要考查动词不定式作定语、宾语、宾语或主语补足语等的用法。还要注意动词不定式的被动式与完成式。
不定式作定语：If there is no choice， there is no decision ______(make) to be made
不定式作宾语： Robots ， already taking over human tasks in the automotive field， are beginning ________(see) . to be seen
不定式作宾补I notice him _______( leave ) the classroom. leave (可省略to)
不定式作主补：They were often compelled ______(work) twelve or fourteen hours a day.
to work(不可省略to)
We make them (to) work day and night.不定式作宾语补语，在有些动词后可以省略TO
They are made to work day and night.不定式作主语补语时，不可省略TO
B.分词：主要考查分词作定语、状语、宾语补足语的用法。注意现在分词与过去分词的区别。另外，还有现在分词的被动式与完成式的形式。
分词作定语：Anyone ______(want) to understand the industry of the future will have to know about robotics. wanting
As research techniques become more advanced， the number of animals _____(use) in experiments may decrease. used
分词作状语： When ______(present) with a common case， sales managers tend to see sales problems and production managers see production problems. presented
________ (tell) that some guests were coming ， she shopped all morning in the supermarket. Having been told
Her body， with hands and feet _______(bind) ， was discovered by a traveler early in the morning. bound
分词做宾补： They may have their passports ______(remove) ， making leaving or
