专题归类复习一情态动词should与could的用法 语法讲解1should是情态动词shall的过去式，但有时并不表示过去。(1)表示委婉的劝告或建议，意为“应该”。如：You should hand in your composition at once.你应该立刻交上你的作文。(2)表示可能性或推断，意为“可能；应该”。如：I think they should be there now.我想他们现在应该在那里。(3)用于特殊疑问句中，表示意外、惊奇、不能理解等强烈感情。如：How should you know that?你是怎么知道那件事的？What should you do to relax?你该做什么来放松呢？2could是情态动词can的过去式，但有时并不表示过去。(1)表示提议，比can更客气、委婉。I could do the shopping for you, if you are tired.如果你累了，我能帮你买东西。(2)表示请求，语气比can更客气、委婉。Could you show me the way to the hospital?你能告诉我去医院的路吗？ 语法精练.单项选择( )1.Schools_allow students at least one hour a day for sports. Awould Bmight Cshould Dcould( )2._you tell me how to get to the post office? AMust BNeed CCould DShould( )3.When can I come for the photos? I need them tomorrow afternoon. They_be ready by 12：00. Acan Bshould Cmight Dneed( )4.Could I borrow your dictionary? Of course you_ Acan Bmust Cshould Dwill( )5.The basketball_his.He loves playing basketball. Amaybe Bmay be Cmay is Dmay not( )6.We_keep the new traffic law and learn how to protect ourselves. Awill Bwould Cshall Dshould( )7.Could you please help me do my homework? Sorry.I_You_do it by yourself. Acould; may Bcouldnt; should Ccant; should Dcant; may( )8.How was the youth club last night, Mark? It was great fun.You_come. Amust Bcan Cshould Dmay.根据句意用should或could填空1Sally_make dumplings by herself when she was only five years old.2In school, all the classmates_get on well with each other.3You_call her if you have something important to tell her.4You_not drive after drinking.5_I use your mobile phone，please?