单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unit 9,Can you come to my party?,Can you come to my party?,Sure,I love to.,Sorry,I cant.,I have to play soccer with my,frients,.,（一般跟在,Sorry,I can,t.,的后面）,Accept Invitations:,Sure/Yes/Of course,Id love to.,Certainly,Id like to.,Decline invitations:,Im sorry,I cant.I have to look after my grandmother.,I have a piano lesson.,I am going shopping with my friend.,help my parents,/,visit my aunt,/,play football,/,study for the English test,/,have a piano lesson,/,go to the mall,/,babysit my sister,/,do homework,/,go to the movies,/,go to my guitar,lesson,/,watch a football match,/,play tennis,/,go to the doctor,/,surf the Internet,/,go fishing,/,relax at home,Explanation,1.can,的用法,（）表邀请。,若接受邀请，,回答为：,OK./All right./Sure./Of course./Certainly./,Yes(Sure),Id love(like)to.,若不接受邀请，,回答为：,Sorry,cant.(+,原因,),eg.Can,you come to the party?,Yes/Sure,Id love/like to.,Sorry,Icant.I have to help my parents.,2.,情态动词“,have to”,与其他的情态动词如：“,can”,“may”“must”,和“,should”,不同。,（,1,）这,4,个情态动词没有人称和数的变化,而,have to,有。它的第三人称单数为“,has to”,过去时为,had to,如：,我们以,can,为例,:,Can,he go with us?,他能和我们一起去吗？,He,cant,go with us.,他不能和我们一起去。,而“,have to”,要加助动词,do,has to,要加助动词,does,还原,have to,had to,要加助动词,did,还原,have to,才可能完成其疑问、否定句。,2,.have to,强调客观上需要做某事，即表示外界条件的需要不得不做某事，含有“客观所迫”的意味，它有人称和数的变化，可用于多种时态中，否定式为“不必”。,must,强调说话者主观上认为必须做某事，含有“主观判断”的意味，它的否定式意为“禁止，不允许”。,eg,.If one gets,ill,hell,have to,see a doctor.,She,has to,go to school by bus.,We,must,go to school on time.,-,Must,I finish the homework now?,-Yes,you,must./,No,you,neednt(dont,have,to).,You,mustnt,play football in the classroom.,3.,I have to,help,my parents.,我不得不帮助我的父母。,help sb.with,sth,.,或,help,sb,(to)do,sth,.,上一句我们可以说：,I have to,help,my parents with the,housework.,或说,I have to,help,my parents(to)do,the housework.,What we have learnt in this lesson?,Summary,