北大MPA考前辅导班英语笔记二

三、情态动词

常用的为：must can need

must a. 必须、命令must do

b. 猜测 must be

c. 否定式：must not 命令 can’t 猜测

d. 没必要的：needn’t

e. must +完成时表猜测，过去一定做了

f. n 必须做的事 = duty this book is a must .

can a. 与must 对应

b. 猜测，可能是can(could)be

c. 强调主观色彩，能力= ability I can’t do it .

fail 客观色彩

d. can (could)have done 本来可以

f. n听、罐 canned food

need a. 与must

b. aux need do it

c. v need to do it

do you need to do ……

d. v need + doing = to be done 被动

+ to do 主动

e. n 需要 in need in need of

should a. aux 应该：猜测 he should be here.

命令、警告

b. should have done本来应该而没有……

在虚拟式里，would用在主句中，should用在从句中

would

a. will n 意志力、遗嘱

v 主观意图 my boss willed(would) it will power

willing a 情愿的

unwilling 不情愿的

willful ad 固执地

b. 时态would have done

c. 固定搭配I would rather you + did

表猜测时都可有进行时态 must / can / should / may + be doing

1、C

2、C

3、D

4、C

5、C

6、B

7、D come what may 无论发生什么

concession to n