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Present 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 finishedhave finishedhas learnedhas 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 donehas not finishedHavebeenhaveseenhascleanedhave 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 homework already.I haven’t done my homework yet.● Mother has just cleaned the house.Mother hasn’t cleaned the house yet.● I have seen the film already. have been to 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 someone stay in some place for some time have gone to 去了某地 （没有回来）Someone went to some place and is still there A BAA BB stay 1.I have gone to Japan before. ( )2.The scenery of Mount Fuji is very beautiful, I have been to there twice. ( )3.His father has been to Beijing .He won’t be back until next week( )4Ho...