资源简介

情态动词
动词分类 实义动词：比如want、like、go等
系动词：feel、taste、sound、look、smell（5个感官动词）等；
助动词：do、does、did；will、shall；have、has等
情态动词：can ，should，must，may等
定义 表能力 I can play basketball
表请求 Can I leave now
表必要 I must study hard.
表建议 You should finish your homework.
情态动词的几大特点
1 情态动词+动词原形
2 情态动词否定后面直接+not
3 情态动词变疑问句，直接提前
4 情态动词无三单、无将来
注意：have to例外，用于第三人称单数时变成has to
情态动词基本用法
序号 原形 过去式 普通含义 推测含义
1 may might 可能，也许 可能，也许
2 can could 能力；请求 /
3 can't couldn't 不能，不可以 不可能（100%确定）
4 will would 将要；一种意愿 /
5 must / 必须 一定（100%确定）
6 mustn't / 禁止 /
7 need / 需要 /
8 needn't / 不需要，不必 /
9 should / 应该 /
10 shouldn't / 不应该 /
情态动词表推测
can't 100%否定推测 不可能 She can't be Lucy.
may 不确定推测 可能 She may be Lucy.
must 100%确定推测 一定 She must be Lucy.
情态动词辨析
1.表能力
can 能力 I can play basketball.=I am able to play basketball.
could can的过去式 I could play basketball when I was young. =I was able to play basketball when I was young.
be able to 相当于can/could /
2.表请求
委婉程度：can——could——may
情态动词 肯定回答 否定回答
can Yes,you can.
Of course. No,you can't
No,you mustn't(禁止)
could
may
——Can/Could/May I leave now
——肯定回答Yes,you can/Of course.
——否定回答No,you can't/No,you mustn't
3.表必要
have to “不得不/必须” 客观条件限制(被迫) don't have to “不必”=needn't
must “必须” 主观条件限制(主动) musn't “禁止”
注意：must引导的疑问句
情态动词 肯定回答 否定回答
must Yes,you must. No,you needn't / No,you don't have to
——Must I finish my homework now
——是的，你必须现在完成。
——Yes,you must.
——不，你不必现在完成。
——No,you needn't / No,you don't have to
4.表建议
should should“应该”shouldn't“不应该” 常用于纠正别人,提出或征询建议
had better had better do sth“最好（做某事）” had better not do sth“最好不（做某事）”
易混淆辨析
maybe 副词，句首或者句末 Maybe she is a teacher.
may be 情态动词+be,句中 She may be a teacher.
may 情态动词，句中 She may go to shop to buy something.
情态动词中的need
1). need 作情态动词用时, need do sth需要做某事
I needn't go there too early.
2). need作实义动词用时，有人称、时态和数的变化。need to do sth需要做某事
I don't need to go there too early.
3). need后面接doing表示被动：sth need doing =sth need to be done.
The washing machine needs repairing. = The washing machine needs to be repaired. 洗衣机需要（被）修理。

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