4. be able to 强调某人通过努力克服 4困. 难Th成e f功ire地sp做re了ad某th事rough the hotel very
quickly but everyone was able to get out
2. 表“许可”，译为“可以”， could比can语气较委婉。用can 或 cannot / can’t 回答 --Can /Could I borrow your bike for a moment? --Yes, you can. / No, you can’t.
11.. cI caann/表am示a现bl在e t的o s能wi力m. 22.. cI coouulldd表/ w示as过ab去le的to能cli力mb a tree when I
was a child.
3. be able to 表能力，可用于多种时态
3. I will be able to swim next week.
Modal Verb
.
情态动词
情态动词表示说话人的语气和情 态的动词。
语气：能力、义务、建议、允诺、 许可、推测。
情态：情感和态度。
.
观察下列各句，注意谓语动词形式。 1.He can finish the paper in an hour.
2.Would you please pass me the dictionary?
English well. 能力
请求/
2. May I have a look at your Iphone? 允许
3. Would you like to join my family for dinner? 请求
4. When going by plane, you should arrive on
.
may/might:
2.用于祈使句中表示祝愿。 May you be happy all your life.
Ma祝y你y成ou功s！ucceed. 3.表示推测、可能（只用于肯定句， 疑问句则要用can或could）。
He may be very busy now.
.
情态动词 含义
否定式
may / might
区别 be able
“能，会”“不会，不能” to
can / could
表许可 “可以” 表推测 “可能”
can’t
代替may
“不可以，不许”
can’t “不可能”
主要用于否定、 疑问句中
1表示某人通过努力克服困难做成某事,要用was / were able to. 2 could, might, would 表委婉语气用于疑问句, 答语仍须用
表许可 mustn’t 不许，严禁 “可以”may not 最好不要 表推测 may not
“可能Байду номын сангаас可能不
.
will 和 would
1. Will you give him a message when you see him. 用于第二人称，表“询问意愿，提出 请求” would you(用于现在时)语气更为婉转
3.She may be very busy now.
4.I will never forget the days we spent together.
5.We should help each other.
.
情态动词的语法特征
1.不能单独做谓语，即是情态动词+动词原形。
例如：I can swim.（谓语）
time.
建议
5. When you eat fish, you must be very careful with the bones. 建议
.
情态动词语法目录 一、can / could 二、may /might 三、will /would 四、shall / should 五、must
一、情态动词表能力
“可能” “不可能”
否定、疑 问句中
补充：金版12页右边第4点
.
May I eat KFC if I finish my
homework?
.
may/might:
1. 表示许可。表示请求、允许时， might比may的语气更委婉一些。 — Might/May I use your computer? — Yes, you can. /No, you can’t/you may not / you mustn’t.
2. We will help him if he asks us to. 表“意志，意愿”，译为“会” 过去时：would
I promised that I would do my best.
.
3. He will always take a walk after supper. 习惯上会发生的事情
(除ought to “应该”和have to“不得不”外) 2.情态动词没有人称，数的变化。 3.有些情态动词有一般式和过去式，过去式比一
般式更委婉。 如can-could , will-would, may-might, shall-should
.
建议, 请求, 允许, 能力
1. Jim isn't good at maths, but he can speak
.
3. 表“可能性”，译为“可能”； Can this news be true? Where can they be? 否定句中，翻译为“不可能” She can’t have left school, for her
bike is still here.
.
情态动词 含义
否定式
注意点
表能力 can’t
can, may, will. 3 can 用于肯定句中, 可表示”有时可能”
.
情态动词 含义 否定式
注意点
表能力 can’t/couldn’t 区别 be “能，会”“不会，不能” able to
can / could
表许可 can’t /couldn’t
“可以” “不可以，不许”
表推测 can’t /couldn’t 主要用于
During the vacation he would often visit me.(过去式)
4. 某种特定情况下真实或可能的事情 At that time, people would starve if