8BUnit1(Grammar).ppt

The Present Perfect Tense 现在完成时的构成1现在完成时的肯定句 主语(I/ We/ You/ They) +have+过去分词 主语（He/ She/It） +has +过去分词 2现在完成时的否定句 句型 主语+have/has+not+过去分词 I haven’t seen the movie yet. He hasn’t visited Beijing since then. 写出下列不规则动词的过去式和过去分词 pay put read ride ring rise run say see sell I ________ (do) my homework already. He _____________(not finished) his homework yet. ____you ever _____(be) to Beijing? We ______ never ______ (see) such an exciting match before. Mother _____ just _______(clean) the house. Please don’t come in. They _________________(read) many books recently. 用动词的适当形式填空 Thank you Goodbye * * 写出下列不规则动词的过去式和过去分词 lead learn leave lend let lie lose make mean meet Grammar 现在完成时 We use the simple past tense to talk about what happened at a definite time in the past. Past present Eddie was born four years ago. We use the present perfect tense to talk about things that started in the past and still have some connection with the present. Eddie has lived with Millie since he was born. Eddie has lived with Millie for four years. present Past Past present 4 years 现在完成时用法一： A.现在完成时态表示动作开始于过去某一时刻，一直延续到现在，或可能还要继续下去。 e.g. 1.He has lived here since 1978. 自从1978年以来，他一直住在这儿。 (动作起始于1978年，一直住到现在,可能还 要继续住下去。) 2. I have been in the army for more than 5 years. 我在部队已经呆了五年多了。 (动作开始于5年前，一直延续至今，有可能还 要继续下去。) B.现在完成时态表示动作发生在过去某一时刻并已结束，但该动作对现在产生了影响，与现在情况具有因果关系。 e.g. 1.He has turned off the light. 他已把灯关了。 ( 动作结束于过去，但说明的是现在的情 况--灯现在不亮了。) 2.She has cleaned the house. 她已经打扫了屋子。 (动作是过去发生的，而对现在所造成的 结果是屋子干净了。) 现在完成时用法二： 1. Would you like to eat more chicken? No, thanks. I have already eaten too much. 2. Are you hungry? Yes. I haven’ t had lunch yet. 3. Will you go to see the film tonight?