三、情態(tài)動詞

常用的為：must can need

must a. 必須、命令must do

b. 猜測 must be

c. 否定式：must not 命令 can’t 猜測

d. 沒必要的：needn’t

e. must +完成時表猜測，過去一定做了

f. n 必須做的事 = duty this book is a must .

can a. 與must 對應(yīng)

b. 猜測，可能是can(could)be

c. 強調(diào)主觀色彩，能力= ability I can’t do it .

fail 客觀色彩

d. can (could)have done 本來可以

f. n聽、罐 canned food

need a. 與must

b. aux need do it

c. v need to do it

do you need to do ……

d. v need + doing = to be done 被動

+ to do 主動

e. n 需要 in need in need of

should a. aux 應(yīng)該：猜測 he should be here.

命令、警告

b. should have done本來應(yīng)該而沒有……

在虛擬式里，would用在主句中，should用在從句中

would

a. will n 意志力、遺囑

v 主觀意圖 my boss willed(would) it will power

willing a 情愿的

unwilling 不情愿的

willful ad 固執(zhí)地

b. 時態(tài)would have done

c. 固定搭配I would rather you + did

表猜測時都可有進行時態(tài) must / can / should / may + be doing

1、C

2、C

3、D

4、C

5、C

6、B

7、D come what may 無論發(fā)生什么

concession to n