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1、Present perfect tensePresent perfect tense現(xiàn)在完成時態(tài) 8BUnit 2 Grammar 1現(xiàn)在完成時態(tài)的含義是表示過去發(fā)生現(xiàn)在完成時態(tài)的含義是表示過去發(fā)生的或已完成的動作對現(xiàn)在造成的影響或的或已完成的動作對現(xiàn)在造成的影響或結(jié)果。特點是既涉及過去，又聯(lián)系現(xiàn)在：結(jié)果。特點是既涉及過去，又聯(lián)系現(xiàn)在：動作是過去發(fā)生的，結(jié)果是現(xiàn)在存在的。動作是過去發(fā)生的，結(jié)果是現(xiàn)在存在的。 Look! The blackboard is so clean now. He has cleaned the blackboard. ( (他已經(jīng)擦過黑板了。他已經(jīng)擦過黑板了。) )

2、這句話所表示的結(jié)果是黑板現(xiàn)在是干凈的。這句話所表示的結(jié)果是黑板現(xiàn)在是干凈的。一、一、現(xiàn)在完成時謂語動詞的構(gòu)成：現(xiàn)在完成時謂語動詞的構(gòu)成：助動詞助動詞HAVE/HAS(NOT) +V-ED（過去分（過去分詞）詞）I _(finish) the composition already. He _(learn) English for three years. We/You/ They. She.這種用法常與這種用法常與ALREADY, JUST, YET, EVER, NEVER, BEFORE(句末句末)等連用等連用. I _ (do) my homework already. He _(not

3、 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：當(dāng)在肯定陳述句中含有注意：當(dāng)在肯定陳述句中含有alreadyalr

4、eady或或just just 時，在轉(zhuǎn)換成否定句或疑問句時，要把句中的時，在轉(zhuǎn)換成否定句或疑問句時，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.

5、 have been to 曾經(jīng)去過某地（已返回）曾經(jīng)去過某地（已返回）Someone went to some place and has already come backhave been in 去某地一段時間去某地一段時間 someone stay in some place for some time have gone to 去了某地去了某地 （沒有回來）（沒有回來）Someone went to some place and is still there A BAA BB stay 1.1.她以前曾去過上海。她以前曾去過上海。 She has been to Shanghai b

6、efore. 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!