1、PEP 六年级上册 专项复习三情态动词1.掌握情态动词理论2.会做相应的练习题游戏规则：按要求每完成一项任务即可获得相应的分数，满10分即可获得一张王牌，集齐10张王牌即可获得一次特权机会。1.情态动词有can(could),may(might),must,have to,shall(should),will(would),need(needed),等。2.情态动词无人称和数的变化；3.不能单独使用，其后必须加动词原形。I can speak English.He can speak English.They can speak English.一、can,could 1)表示能力（体力、知识
2、、技能）。eg:May can speak English.（知识）I can ski.（技能）此时可用be able to代替。can只有一般现在时和一般过去时；而be able to则有更多的时态。eg:Ill not be able to come this afternoon.当表示“经过努力才得以做成功某事”时应用be able to，不能用can。2)表示请求和允许。Can I go now?Yes,you can./No,you cant.此时可与may互换。在疑问句中还可用could,might代替，不是过去式，只是语气更委婉，不能用于肯定句和答语中。Could I come
3、to see you tomorrow?Yes,you can.(No,Im afraid not.)二、may,might 1)表示请求和允许。might比 may语气更委婉,而不是过去式。否定回答时可用cant 或mustnt,表示“不可以，禁止”。Might/May I smoke in this room?No,you mustnt.May/Might I take this book out of the room?Yes,you can.(No,you cant/mustnt.)用May I.？征徇对方许可时比较正式和客气，而用Can I.？在口语中更常见。2）用于祈使句，表示祝愿
4、。May you succeed!3)表示推测、可能性（不用于疑问句）。might不是过去式，它所表示的可能性比may小。1.He may/might be very busy now.2.Your mother may/might not know the truth.三、must,have to 1)表示必须、必要。在回答引出的问句时，如果是否定的，不能用mustnt（禁止，不准），而用neednt,dont have to（不必）.Must we hand in our homework today?Yes,you must.No,you dont have to./No,you nee
5、dnt.2)must是说话人的主观看法，而have to则强调客观需要。must只有一般现在时，have to 有更多的时态形式。1.The play isnt interesting,I really must go now.2.I had to work when I was your age.3)表示推测、可能性（只用于肯定的陈述句）Your mother must be waiting for you now.四、shall,should 1)shall 用于第一人称，征求对方的意见。What shall we do this afternoon?我们今天下午应该做什么？2)shall
6、 用于第二、三人称，表示说话人给对方的命令、警告、允诺或威胁。You shall fail if you dont work hard.(警告)如果你不努力工作，你会失败。五、will,would 1)表示请求、建议等，would更委婉。Will/Would you pass me the pen,please?2)表示意志、愿望和决心。I will never do that again.3)表示估计和猜想。It would be about 11 oclock when he left home.练习：句型转换（10分,每题1分）1.I can speak English.变为一般疑问句：
7、_变为否定句：_对划线处提问：_Can you speak English?I cant speak English.What can you do?2.He will go to the USA next year.变为一般疑问句：_变为否定句：_对划线处提问：_Will he go to the USA next year?He will not go to the USA next year.When will he go to the USA?3.We will have an English party this Sunday.变为否定句：_对划线处提问：_We will not have an English party this Sunday.What will you do this Sunday?4.My friend can jump high.变为否定句：_对划线处提问：_My friend can not jump high.Whose friend can jump high?