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示過(guò)去某段時(shí)間或某一時(shí)刻正在發(fā)生或進(jìn)行的行為或動(dòng)作。(2) 基本結(jié)構(gòu):was/were + doing(3) 時(shí)間狀語(yǔ):at this time yesterday, at that time或以when引導(dǎo)的謂語(yǔ)動(dòng)詞是一般過(guò)去時(shí)的時(shí)間狀語(yǔ)等。(4) 用法:①表示過(guò)去某時(shí)正在發(fā)生或進(jìn)行的動(dòng)作。例:When I came home yesterday, they were having dinner.(昨晚我回家的時(shí)候他們?cè)诔酝盹?。)②表示過(guò)去某一階段一直在進(jìn)行的動(dòng)作。例:They were building a bridge last winter.(他們?nèi)ツ甓煸诮ㄒ蛔鶚?。)?) 否定形式:was/were + not + doing.(6) 一般疑問(wèn)句:把was或were放于句首。練習(xí)(exercises):1. Mary __________(do) her homework at 7 . yesterday.2. She __________(clean) the house the whole afternoon yesterday. (她昨天整個(gè)下午都在打掃房子。)5. 現(xiàn)在完成時(shí)(1) 概念:過(guò)去發(fā)生或已經(jīng)完成的動(dòng)作對(duì)現(xiàn)在造成的影響或結(jié)果,或從過(guò)去已經(jīng)開(kāi)始,持續(xù)到現(xiàn)在的動(dòng)作或狀態(tài)。(2) 基本結(jié)構(gòu):have/has + done(3) 時(shí)間狀語(yǔ):recently, lately, since…for…,in the past few years, etc.(4) 用法:①表示動(dòng)作到現(xiàn)在為止已經(jīng)完成或剛剛完成。例:I have already finished my breakfast. (我已經(jīng)吃完早飯了。)②表示發(fā)生在過(guò)去但對(duì)現(xiàn)在仍有影響的動(dòng)作或情況。例:John has broken his left leg. (約翰摔斷了他的左腿。)③表示從過(guò)去某時(shí)刻開(kāi)始,持續(xù)到現(xiàn)在的動(dòng)作或情況,并有可能會(huì)持續(xù)下去。通常要與表示一段時(shí)間的狀語(yǔ)連用,如since+過(guò)去時(shí)間點(diǎn),for+一段時(shí)間,by+現(xiàn)在時(shí)間等。例:He has lived here since 1960. (他從1960年開(kāi)始就住在這兒了)(5) 否定形式:have/has + not + done.(6) 一般疑問(wèn)句:have或has提前。練習(xí)(exercises):1. I bought a new house, but I ______ my old one yet.A. didn’t sell ’t sold sell2. She __________(find) her lost pen.3. He __________(live) here for 10 years.6. 過(guò)去完成時(shí)(1) 概念:以過(guò)去某個(gè)時(shí)間為標(biāo)準(zhǔn),在此