Unit-8现在完成时课件.ppt

现在完成时 ;一)构成:; 二)?? 含义:;句式构成;2. 否定句:;3.一般疑问句;（改为否定句和一般疑问句并肯否回答) I have seen him since his wedding day.  ;;不规则动词原型-过去式-过去分词形式：;;1. 现在完成时中标志词的用法区别 ;注: 有already的句子在时态上并不都是现在完成时,判断时要看该词后是否有动词的过去分词. Eg. She’s already eighty years old. It was already very late. ;2. yet在现在完成时中的用法 ;注: 带already的肯定句变成否定句或疑问句时,将already要变成yet放在句末. ;? 3. ever在现在完成时中的用法 ;4. never在现在完成时中的用法;注: 带ever的肯定句变否定句时, 要将ever变成never; 带ever的一般疑问句作否定回答时可用“No, never.” ;5. just在现在完成时中的用法;6. before在现在完成时中的用法 ;? (定义二) 表示一个从过去开始,一直持续到现在,有可能继续下去的动作或状态.通常和for或since引导的时间状语连用. ;1.for + ;2. since + ;注2): 对for或since引导的时间状语提问 必须用how long, 决不能用when. ;注3): 短暂性动词不能和for或since引导的时间状语连用, 当然也不能用于how long引导的问句中. Eg.(误)I have left there for 5 years. ;※短暂性动词与延续动词间的转换 ;5.短暂动词和 延续动词转换;瞬间性动词;练习; have /has been to，have / has gone to， have / has been in的用法区别 ;;用have/has been to, have/has been in或have/has gone to填空 --- Where is your brother? --- He ____________ the shop. He’ll be back soon. 2. --- ____ you ever ___________ America? --- Yes, I _____________ New York twice. 3. --- Here you are at last! Where _____ you ______? --- I ____________ London for two months. --- When did you come back, then? --- I came back only this morning. ;四)It is +一段时间 +since+句子(一般过去时) =一段时间+has passed +since + 句子(一般过去时) ;练习; （一）现在完成时与一般过去时的区别 ;He has lived in Beijing since 1999. 自1999年以来他一直住在北京。 （说明他现在仍然在北京。） He lived in Bejing in 1999. 在1999年的时候他在北京住过。 （现在是否住在北京不知道）;Translation;II. 将下列句子中的动词改为现在完成时. John is drawing a picture. I write my name on the4 card. Tom blows out the light. The cat drinks its milk. The tree falls across the road. My parents give me a present. ;单项选择 He ______ working. A. have just started B. has just started C. Has just stars D. has just started 2. _____ you _____ your suitcase yet? Do, pack B. did, pack C. Have, pack D. Have , packed 3. I ______ my room already. have tidied B. had tidied C. have tidied D. will tidy 4. There ____ several meetings during the past few day