情态动词

p167

原形&过去时

原形	过去时	中文
Will	would	将会
can	could	能够
shall	should	应该要做 (=ought to do)
may	might	也许
Have to	had to	不得不
must	-	必须

注：must 无过去时。

注意

can't “不能；不可能”

You can't be Yanzu. Yanzu is so handsome.
你不可能是彦祖，彦祖是如此的帅。

情态动词的用法特点

• 不能单独作谓语
• 后面接动词原形
• 否定通常直接在其后加 not

情态动词+have done

May/might have done　　过去也许
Would have done　　　　本来会做
Should have done　　　本来应该做
Ought to have done　　本来应该做
Could have done　　　本来能够做

注意

Must have done

• 过去一定
• 对过去事情的肯定推测

它的否定如下

can't/couldn't have done

• 过去不可能
• 对过去事情的否定推测

随堂练习

Aunt Sharon looks sleepy. She ______ have gone to bed very late last night. ✅

answer

must ✅
or -> may/might ✅