八年级下册语法专题一：情态动词should与could

专题归类复习一情态动词should与could的用法●语法讲解1．should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：Youshouldhandinyourcompositionatonce.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：Ithinktheyshouldbetherenow.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：Howshouldyouknowthat?你是怎么知道那件事的？Whatshouldyoudotorelax?你该做什么来放松呢？2．could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。Icoulddotheshoppingforyou,ifyouaretired.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。Couldyoushowmethewaytothehospital?你能告诉我去医院的路吗？●语法精练Ⅰ.单项选择()1.Schools________allowstudentsatleastonehouradayforsports.A．wouldB．mightC．shouldD．could()2.________youtellmehowtogettothepostoffice?A．MustB．NeedC．CouldD．Should()3.—WhencanIcomeforthephotos?Ineedthemtomorrowafternoon.—They________bereadyby12：00.A．canB．shouldC．mightD．need()4.—CouldIborrowyourdictionary?—Ofcourseyou________．A．canB．mustC．shouldD．will()5.Thebasketball________his.Helovesplayingbasketball.A．maybeB．maybeC．mayisD．maynot()6.We________keepthenewtrafficlawandlearnhowtoprotectourselves.A．willB．wouldC．shallD．should()7.—Couldyoupleasehelpmedomyhomework?—Sorry.I________．You________doitbyyourself.A．could;mayB．couldn't;shouldC．can't;shouldD．can't;may()8.—Howwastheyouthclublastnight,Mark?—Itwasgreatfun.You________come.A．mustB．canC．shouldD．mayⅡ.根据句意用should或could填空1．Sally________makedumplingsbyherselfwhenshewasonlyfiveyearsold.2．Inschool,alltheclassmates__________getonwellwitheachother.3．You________callherifyouhavesomethingimportanttotellher.4．You_________notdriveafterdrinking.5．_________Iuseyourmobilephone，please?