知识点1:虚拟语气用在其它状语从句中
In case I ______, I would try again.
a. will fail b. would miss c. should fail d. shall miss[1]shall,will,相关知识点

“will / shall＋动词原形”与“be going to＋动词原形”“will / shall＋动词原形”与“be going to＋动词原形”两者均可表示将来时间和意图，有时可以换用。如：I think it’ll rain this evening. / I think it’s going to rain this evening. 我想今晚会下雨。I won’t

You should exercise vigilance _____ you should be killed.
a. so that b. lest c. therefore d. that
3.虚拟语气用在由 “whether” 引导的让步状语从句中，从句谓语用原形动词。例如：[2]从句,动词,相关知识点

在“动词+宾语+宾补”结构中,如果宾语是不定式、动名词、宾语从句,则常用it做形式宾语,而将实际的宾语移到补语后面去。如：I found the job rather difficult. (我发觉这个工作相当难做。)I found it rather difficult to do the job.

All engines work on this principle, whether they be large or small.[3]work,this,相关知识点

受中文的影响，这个介词常常被误用。当你要表达在一段时间内某个动作可以完成时，一定要用in，而不能用after，因为after是指在某一时间之后。例如：This work will be done in two days. 即表明在两天内这一工作一定会做完。而如用了after，即表示在两天之后，完成的时间是不确定的。［误］ My father will be back after

所有发动机都按这一原理工作，无论它们是大还是小。
We must finish the work before we go home, whether it be early or late.
无论时间早晚，我们必须在回家前干完工作。
All matter, whether it be gas, liquid or solid, is made up of atoms.
所有物质，不论是气体，液体，或固体，都是由原子构成。
在此句型中，可省去 whether ，而将be放在主语前。例如：
Be it so, we must continue to do the test.
We must do our best to fulfil the task, be it ever so hard.
Example:
______ I'll marry him all the same.
a. Were he rich or poor b. Be he rich or poor[4]rich,poor,相关知识点

rich and poor 与 rich or poor的用法比较rich and poor 与 rich or poor的用法比较比较 rich and poor 与 rich or poor的用法：前者相当于名词，意为“穷人和富人”“贫富”；后者相当于副词，用作状语(表示让步），意为“不管是穷人还是富人”。如：Times are hard for rich and poor

c. Whether rich or poor d. Being rich or poor
练习题：
1.______, I must do another experiment.
a. It is ever so late
b. Ever so late it[5]late单词记忆法

◆记忆方法一：联想方式：爸爸工作很辛苦，每天la（拉）东西，te（特）晚才回来。◆记忆方法二：联想方式：late－date记忆方法：老大记下小明迟到的日期。

c. Be it ever so late
d. Whether be it ever so late
2.The young driver looked over the engine carefully lest it ______ on the way.
a. goes wrong b. would go wrong
c. went wrong d. should go wrong
3.Machines are often oiled so that they ______ well.[6]often单词记忆法

◆记忆方法一：联想方式：of（…的；对于）＋ten（十）对于他来说，每次吃十碗饭是经常的事。◆记忆方法二：联想方式：of（…的；对于）＋ten（十）记忆方法：对于他来说，每次吃十碗饭是经常的事。

a. ran b. runs c. should run d. running
4.Even if he ______ very busy, he would have kept on learning English.[7]would,have,相关知识点

If I had V-ed, I would have ...句型结构分析语法讲解：句子成分、什么句型句法，怎么用什么意思 I might have been incredulous had I not been accustomed to such responses. 若非我已经习惯了这样的回答，我可能不敢轻易相信。 Had he not apolo