初二教材第2单元语法点.ppt

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1、育龙科教英语培训中心初二学校教材定义:表示说话人的语的，后面接动词 原形。常见的V情:can,could,may,might shall,should,will,would must,needV情的否定式:V情+not表示“能”；could表示过去的能力=be able to+V原（有各种时态的变化）例：I could play the piano when I was four.was able to表示“请求”（could的语气比can委婉）例：Could you please do me a favor?表示“请求”(might比may语气委婉)Can/Could/Might/May I

2、?(表“请求)can语气最不正式could语气委婉较客气may/might用于正式场合，语气恭敬（might 比may更客气）may的否定：一般用must not回答例：May I use you pen?No,you must not.表示“可能性”:can,could,may,might例：The light is on,the teacher may be in the office.表“必须”，与have to比较：must强调主观看法：例：I must study hard.have to强调客观感受：例：I have to study hard.have to有人称的变化：例：Sh

3、e has to go.I had to sell my bike at that time.must的否定式表“不许，禁止“例：You must not play on the street.回答must的否定用neednt或dont have to.例：Must I open the door?Yes,you must.No,you neednt/dont have to 表示“一定”：例：The hat must Toms,because his name is on it.shall用于第一人称的疑问句中,表示 “建议”例：Shall we go camping this weeken

4、d?shall用于第一人称的肯定句中,表示 “将要”,同“will”例：I shall be a teacher.should译为“应该”：表义务：例：We should save water.提建议：例：You should give up smoking.Should I lend him some money?实义动词“需要”：need to do sth.need doing sth=need to be done (表被动)情态动词“必要”，用于疑问和否定句中例：Need he go now?No,he neednt./Yes,he must.表“建议，忠告”例：Youd better see a doctor.其否定：had better+not例：Youd better not eat spicy food.