8B+Unit+1+Past+and+present+grammar（共26张PPT）.ppt

阅读六个句子，讨论并完成问题1. She has helped the children with their lessons for an hour.2. They have learned English for three years.3. I /we have not told it to him. 4. Jim has not seen the film before.5.Has he finished his homework yet? Yes, he has./No, he hasn’t. 1.现在完成时结构 肯定：______+_______+_____  否定：______ + ______+______ 一般疑问句：把________提前 肯定回答 ______ / 否定回答_______ 2.have not 可缩写成____has not 可缩写成 ___ 现在完成时的构成 ? 现在完成时的基本句型 ①陈述句肯定形式。主语+ have/has+ 过去分词+其它 e.g. I have had lunch. ??已经吃过午饭了。????? ?? He has gone to Beijing. ????? 他去北京了。 ②陈述句否定形式。主语+ have/has+ not+过去分词+… （在助动词have/has后+not，可缩写为haven’t/hasn’t） e.g.? I haven’t had lunch. ? 我还没吃午饭??????????? ???? He hasn’t gone to Beijing. 他还没有去北京。 ③一般疑问句形式及其答语。Have/Has+主语＋过去分词＋… （将助动词have/has提前，句末加问号） 肯定回答：Yes , 主语＋ have/has. 否定回答：No , 主语＋ haven’t/hasn’t. －Has he gone to Beijing? 他去过北京了吗？ －Yes, he has?./?No, he hasn’t. ④特殊疑问句形式。（疑问词+一般疑问句） ??特词+ have/has+主语＋过去分词＋…？ ?????e.g. Where has he gone? ??? 他去了哪里？ 动词的过去式和过去分词的构成: 过去分词的构成 活动一(仿照例句看表格造句） 现在完成时的时间状语 ◆常与不确定的时间状语连用，如:already, never, ever, just, yet, before, so far, in the past few years等,表示“到目前为止”所发生的动作. “already” 用于现在完成时的肯定句中, “yet” 用于现在完成时的否定句和疑问句中. 用“already” “yet”填空 He has ( ) visited many ?places in China. ( ) ?? 注意 already 在句中的两种位置. ?? The train hasnt arrived .火车（到现在）还没有到。 Has she arrived ?? 她已经到了吗？Hasnt he come ? 她还没来吗？ Conclusion 写出下列动词的过去分词 travel _____ visit _____ live ______ miss _____ move ______ learn ______ A guessing game Why do I look so happy? A guessing game Why is Yao Ming so tired? 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 _____________(practice) this dialogue twice. * * Unit 1 Grammar The Present Perfect Tense We use the simple past tense to tal