1、Unit 7 Abilities,can,could,may的用法 这三个词都是情态动词。情态动词本身有一定的意义,但没有人称和数的变化,需要和实义动词一起构成句子的谓语部分,表示说话者的情感、态度和语气。 1.can和could表示能力。 ( 1 )can意为“能,会”,用来表示某人现在的能力;could是can的过去式,用来表示某人过去的能力。例如: I couldnt understand his words last year,but now I can.去年我还不能理解他的话,但现在我能理解了。,( 2 )can表示能力时,与be able to同义,二者一般可互换,但can只有一般
2、现在时和一般过去时两种时态,而be able to中的be动词的形式根据句子所用时态变化。例如: You will be able to pass the exam tomorrow.明天你能通过考试。 2.can,could和may表示许可。 情态动词can,could和may可以用来表示请求或许可。情态动词could表示一种委婉的语气,比can表达更有礼貌,常用于问句中。may较正式。 注意:对情态动词could的回答不能用could,只能用can。例如: Could I borrow your ruler?我可以借你的尺子吗? Yes,you can./Sorry,you cant.是的
3、,你可以。/对不起,你不可以。,.根据句意用can,could或may填空 1.Mary said she could not sing Chinese songs. 2.I have six dogs.You can/may choose any of them. 3.The little boy could not swim very well at the age of eleven. 4.The boy can not be Jack.He has gone to China with his parents. 5.Where is my card? I dont know.It ma
4、y be in your bag.,.单项填空 ( C )1.Could we picnic here? .Have a nice time. A.Yes,you could B.No,you couldnt C.Yes,you can D.No,you cant ( D )2.Pauline has lost her phone. No.Its in her bag.I hear it. A.must B.shall C.may D.can ( B )3. interesting the film is! Yes.I have seen it twice. A.What B.How C.Wh
5、at an D.How an,( A )4. delicious these beef noodles are! A.How B.What C.What a D.How a ( B )5. sunshine!Shall we take a walk in the garden? A.What a beautiful B.What beautiful C.How a beautiful D.How beautiful,.按要求完成句子,每空一词 1.I can speak English.( 改为一般疑问句,并作否定回答 ) Can you speak English? No ,I cant . 2.The old man could ride a horse.( 改为同义句 ) The old man was able to ride a horse. 3.The food is very nice.( 改为感叹句 )What nice food it is! 4.This movie is very interesting.( 改为感叹句 )How interesting this movie is!,
