答案：1 is lying 2 is mending 3 are playing 4 are doing

　　5 Is cleaning 6 is singing 7 likes ; is wearing

　　一、把動(dòng)詞變成現在分詞形式易出錯

　　例：1、They are swiming.(swim)

　　2 、Jenny is plaiing(play)football.

　　答案：1.swimming 2 .playing

　　解析：動(dòng)詞變現在分詞可有如下口訣:“一添一去y不變”. “一添”指雙寫(xiě)規則;“一去”指去掉不發(fā)音字母e規則;“y不變”指要與名詞變復數區分開(kāi)。

　　二、丟掉be動(dòng)詞或忘記把動(dòng)詞變成現在分詞

　　例：1、 Look,two children flying.(fly) a kite in the park.

　　2 、Li Mingisn’t read ( not read) a book in bed now.

　　答案：1 are flying 2 isn’t reading

　　解析:現在進(jìn)行時(shí)肯定句的結構規律為: “be+現在分詞,缺一不可”。這一點(diǎn)必須牢記。

　　三、對動(dòng)詞或動(dòng)詞詞組提問(wèn)時(shí)丟掉doing

　　例：1 、The students are singing in the room.(對劃線(xiàn)部分提問(wèn))

　　What are the students in the room?

　　答案：What are the students doing in the room?

　　解析:現在進(jìn)行時(shí)態(tài)中對動(dòng)作提問(wèn)可記住此句式“What +be +主語(yǔ)+doing+其它?”

　　或簡(jiǎn)寫(xiě)為“What......doing......”?句式。

　　四、現在進(jìn)行時(shí)態(tài)的選擇疑問(wèn)句中易忽視or后用現在分詞形式

　　例：孩子們在跑還是在跳?

　　Are the children running or jump?

　　答案：Are the children running or jumping?

　　解析: or連接的是兩個(gè)并列成分，動(dòng)詞形式須一致。

　　過(guò)去進(jìn)行時(shí)

　　其結構是助動(dòng)詞be的過(guò)去形式was/were +v-ing.

　　其句式變化仍然要在be上做文章。E.g. We were working in class.

　　We weren’t working in class. Were you working in class?

　　1) 概念：表示過(guò)去某時(shí)正在進(jìn)行的狀態(tài)或動(dòng)作。

　　E.g. They were playing football at ten o’clock yesterday morning.

　　My mother was cooking when I got home.

　　I was washing my clothes at this time yesterday.

　　2) 過(guò)去某階段持續進(jìn)行的動(dòng)作 What were you doing during the holiday? 另外，在復合句中，若主要動(dòng)作和背景動(dòng)作是同時(shí)發(fā)生的，那么主從句都可用過(guò)去進(jìn)行時(shí)e.g. Jenny was reading while Danny was writing.

　　3) 常用的時(shí)間狀語(yǔ)

　　過(guò)去進(jìn)行時(shí)常與過(guò)去某一特定時(shí)間的狀語(yǔ)連用，如 last night, at that time, at noon yesterday, last Sunday 等。也有時(shí)沒(méi)有時(shí)間狀語(yǔ)，要通過(guò)上下文的暗示來(lái)確定用過(guò)去進(jìn)行時(shí)。E.g. The students all worked hard. Everyone knew what he was working for.

　　My brother fell while he was riding his bicycle and hurt himself.

　　It was raining when they left the station.

　　When I got to the top of the mountain, the sun was shining.

　　典型例題

　　1) Mary ___ a dress when she cut her finger.

　　A. made　 B. is making　 C. was making　 D. makes

　　答案C. 割傷手指是已發(fā)生的事情，應用過(guò)去時(shí)。同　時(shí)，when表時(shí)間的同時(shí)性，"瑪麗在做衣服時(shí)"提供事情發(fā)生的背景，因此用過(guò)去進(jìn)行時(shí)。

　　2) As she ___ the newspaper, Granny ___ asleep.

　　read; was falling　B. was reading; fell　C. was reading; was falling　D. read;fell

　　答案B.句中的as = when, while，意為"當……之時(shí)"。描述一件事發(fā)生的背景時(shí)，用過(guò)去進(jìn)行;一個(gè)長(cháng)動(dòng)作發(fā)生的時(shí)候，另一個(gè)短動(dòng)作發(fā)生。句意為 "在她看報紙時(shí)，奶奶睡著(zhù)了。"句中的 fell (fall的過(guò)去時(shí))，是系動(dòng)詞，后跟形容詞，如：fall sick。

　　做題時(shí)常見(jiàn)錯誤如下：

　　一、易把be+現在分詞記成be+過(guò)去分詞

　　例：He was talked (talk) to his mum at that time.

　　答案：was talking

　　解析：過(guò)去進(jìn)行時(shí)與現在進(jìn)行時(shí)結構上的區別體現在be動(dòng)詞上。

　　二、丟掉be動(dòng)詞或忘記把動(dòng)詞變成現在分詞

　　例：1 I watching (watch) TV when he came in.

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