1、第三课时Section A(Grammar Focus3c),单元同步语法精讲,(一)情态动词can1含义：情态动词can表示说话人的语气或情态，基本意思是“能；会”，没有人称和数的变化，在句子中不能常独作谓语，其后须跟实义动词原形；can的否定形式为can not/cant/cannot；过去式为could，其过去否定形式为could not/couldnt。2can的用法表示能力，意为“能；会”等。Can you speak English？你会讲英语吗？Yes，I can.是的，我会。多用在口语中，表示请求或允许，意为“可以；能”等。用于疑问句中表示提出要求；用于否定句中表示不允许。,【
2、注意】can表示请求，用于发出邀请，如果接受对方的邀请，常用Sure，Id love(like)to./Certainly/Of course.等来回答；如不接受，常用Sorry等来有礼貌地拒绝。一般情况下需要说明不能接受邀请的原因以表示歉意。eg：Can you come to my birthday party tomorrow？明天你能来参加我的生日聚会吗？Sorry，I am afraid not.Im going to visit my grandpa.对不起，我恐怕不能去，我打算去看望爷爷。,(二)have to的用法“have to”意为“不得不，必须”，它强调一种客观情况，有单
3、、复数及时态的变化，其第三人称单数为has to，过去式为had to。eg:His mother is ill.He has to stay at home and look after her.他妈妈病了。他不得不待在家里照顾她。have to 与must的区别：have to意为“不得不；必须”，它强调一种客观情况。must意为“必须”，着重于说话人主观上认为有义务、有必要。eg:We have to go home now because its dark.我们现在必须回家因为天黑了。You must do it yourself.你必须自己做。have to 有单复数及时态的变化，m
4、ust无人称、时态、数的变化。,单元同步语法强化训练,一、单项选择。1_I have some bananas?Yes，please.ACan BNeed CMust DShould2Can you come to Susans party?Sorry，I_look after my grandma.Aam Bhave to Ccan Ddo3Can you come and play baseball games with us?_.I must study for a test.AYes，I can BYes，I doCI am afraid not DSure，Id love,A,B,C
5、,4Will you go to museum with me this afternoon?Sorry，_.My aunt is coming to see me.AI dont BI cantCI mustnt DI am not5_you come to my party on Sunday?Sure，Id love to.AMust BCan CShould DNeed,B,B,二、按要求完成句子。6They can go to the tennis game.(改为一般疑问句)_ _go to the tennis game?7Can you play soccer with me
6、this afternoon？(作肯定回答)Sure，_ _ _.8Can she go there by taxi？(作否定回答)No，_ _.9He has to go_to_the_doctor(对画线部分提问)_ _he have to_？10They can come to our school on_Tuesday(对画线部分提问)_ _they come to your school?,Can they,Id love/like to,she cant,What does,do,When can,1invite 动词，意为“邀请”；其名词形式是invitation。常用短语：in
7、vite sb.to地点，意为“邀请某人到某地”。invite sb.to do sth.意为“邀请某人做某事”。2accept 动词，意为“收到；接受”，强调主观上愿意接受。3refuse 动词，意为“拒绝”，常用短语：refuse sb./sth.拒绝某人/某物refuse to do sth.拒绝做某事,从方框内选词并用其适当形式填空。,1Thank you for_me to your birthday party，but I am busy next week.2He _to do his homework，so his father was angry.3Why didnt you_my best wishes?I really loved you.,inviting,refused,accept,