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Present perfect tensePresent perfect tense现在完成时态 8BUnit 2 Grammar 1现在完成时态的含义是表示过去发生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：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。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。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。这句话所表示的结果是黑板现在是干净的。一、一、现在完成时谓语动词的构成：现在完成时谓语动词的构成：助动词助动词HAVE/HAS(NOT) +V-ED（过去分（过去分词）词）I _(finish) the composition already. He _(learn) English for three years. We/You/ They. She.这种用法常与这种用法常与ALREADY, JUST, YET, EVER, NEVER, BEFORE(句末句末)等连用等连用. 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 dont come in. They _(practice) this dialogue twice.have donehas not finishedHavebeenhaveseenhascleanedhave practiced注意：当在肯定陈述句中含有注意：当在肯定陈述句中含有alreadyalready或或just just 时，在转换成否定句或疑问句时，要把句中的时，在转换成否定句或疑问句时，要把句中的already already 或或just just 去掉，在句末加上去掉，在句末加上yet. yet. I havent seen the film yet. I have done my homework already.I havent done my homework yet. Mother has just cleaned the house.Mother hasnt cleaned the house yet. I have seen the film already. have been to 曾经去过某地（已返回）曾经去过某地（已返回）Someone went to some place and has already come backhave been in 去某地一段时间去某地一段时间 someone stay in some place for some time have gone to 去了某地去了某地 （没有回来）（没有回来）Someone went to some place and is still there A BAA BB stay 1.1.她以前曾去过上海。她以前曾去过上海。 She has been to Shanghai before. 2.2.他在上海他在上海1010年了。年了。 She has been in Shanghai for ten years 3.他去上海了。他去上海了。He has gone to Shanghai.translationsWork in pairsReplace the underlined words with your own ideasA: Have ever been to City Library?B: Yes .I often go there with kitty?A:But wheres Kitty today?B: She has gone to the library again.A: How long has she been in the library?B:I dont know.Finish the exercises on Page 31Bye-bye!Bye-bye!
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