2017-2018学年牛津译林版八年级英语下册课件：Unit2 grammar1 (共11张PPT)

Using have/has been and have/has gone 8BUnit 2 Grammar 1 ▲现在完成时态的含义是表示过去发生的或已完成的动作对现在造成的影响或结果。特点是既涉及过去，又联系现在：动作是过去发生的，结果是现在存在的。 Look! The blackboard is so clean now. He has cleaned the blackboard. (他已经擦过黑板了。)  这句话所表示的结果是黑板现在是干净的。 一、现在完成时谓语动词的构成： 助动词have/has(not) +V-ed（过去分词） I ______________(finish) the composition already. He ___________(learn) English for three years. We/You/ They…. She…. have finished has learned 这种用法常与already, just, yet, ever, never, before(句末)等连用. 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. have done has not finished Have been have seen has cleaned have practiced 注意：当在肯定陈述句中含有already或just 时，在转换成否定句或疑问句时，要把句中的already 或just 去掉，在句末加上yet. I haven’t seen the film yet. ● I have done my homewor