現(xiàn)在完成時結(jié)構(gòu)

1、現(xiàn)在完成時的構(gòu)成陳述句：s 主語+ have/ has+動詞過去分詞I have had dinner?否認(rèn)形式： S 主語 + hasn't/haven't +動詞的過去分詞I haven't had dinner.疑問形式：Have/has + S 主語+動詞過去分詞Have you had dinner?肯定答復(fù)：Yes, S 主語+ have/ has.否認(rèn)答復(fù) ：No, S 主語 + have/ has+ not.現(xiàn)在完成時適用范圍：1、 談?wù)撨^去發(fā)生的事情，但是發(fā)生的時間不重要.e.g. She has broken her arm她傷了她的胳膊.2、談?wù)撨^

2、去發(fā)生的某事，但對現(xiàn)在造成了影響ug? She has broken her ann, so she can't play basketba?ll她傷了她的胳膊 ?所以她不能打籃球了 .3、過去開始的某事 ,現(xiàn)在還在繼續(xù) .e.g. He has lived in China for 20 years.他已經(jīng)在中國住了 20年了.He has lived in China since 1993.4. 剛剛發(fā)生的事情 .e.g. They have just arrived at the airport 他們剛剛至 U達(dá)了機(jī)場5. 經(jīng)歷或取得的成就 .e.g. He has passed

3、 his math exam with a high mark.他以高分通過了他的數(shù)學(xué)考試 . 現(xiàn)在完成時態(tài)中的重要標(biāo)志迥 already, yet, just, n ever, ever用 法區(qū)另 V1、already意思是"己經(jīng)"A、通常用手陳述句中放在 have和has的后面B、也可用于疑問句，表示期望得到肯定的答復(fù)或表示驚異，此時 already常放在句末。She has already found her bike.Has she found her bike already 她己經(jīng)找到自行車了？2、yet 用法A、yet 可用于否認(rèn)句，此時譯為“還 =I hav

4、en't found my ruler yet.B、也可以用于疑問句，譯為“己經(jīng)放在have和has的后而也可 放在句末Have you found your ruler yet?你己經(jīng)找到尺子了嗎？3、just 只用于陳述句意思是“岡I have just received a letter.I才"放在have和has的后而放在 have和has的后面4、never用于否認(rèn)句譯為"從不 Uve never been to Beijing.have和has的后面5、ever?用于疑問句譯為“曾經(jīng)放在 Have you ever been to Beijing?cle

5、a n clea ned arrive 一 arrived empty emptied規(guī)那么動詞過去分詞和過去式變法一樣K 一般情況在詞尾+ed2、以不發(fā)音的e結(jié)尾的詞+d3.輔音字母+y結(jié)尾的去y加ied4雙與最后一個輔音字母加 ed不規(guī)那么動詞的過去式以及過去分詞巧記規(guī)律lx A: put-put-put let-let-let2、ABA: come ame ome3、ABB: stand stood stood 4、ABC: eat ate atenAAA : cost-cost-costread-read-readput-put-putcut-cut-cutlet-let-letset

6、-set-setAAA變化的單詞，結(jié)尾字母一般是t或do特殊：動詞read,變化是read-read-read八音分別是ri:d ? red卜red。ABA :有些動詞的過去分詞與原形是二g的:run-ran-mn come-came-come become-beca ni e-becomeABC :take-took-take ngive-gave-give nfall-fell-falle neat-ate-eate nwrite-wrote-writte n原型過去式過去分詞例詞-eak-oke-oke nspeak-ear-ore? ornwear? ow (aw)-ew-ow ngrow(種，生長),know, throw,draw-i-u-swim, drink, sing, begi n-i-0-ndrive, rise, writeABC有些動詞的過去分詞是在原形詞尾加n或en ,變成以 en結(jié)尾的單詞。forget-forgot