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、把動詞變成現(xiàn)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：動詞變現(xiàn)在分詞可有如下口訣:“一添一去y不變”. “一添”指雙寫規(guī)則;“一去”指去掉不發(fā)音字母e規(guī)則;“y不變”指要與名詞變復(fù)數(shù)區(qū)分開。

　　二、丟掉be動詞或忘記把動詞變成現(xiàn)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(xiàn)在進(jìn)行時肯定句的結(jié)構(gòu)規(guī)律為: “be+現(xiàn)在分詞,缺一不可”。這一點必須牢記。

　　三、對動詞或動詞詞組提問時丟掉doing

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

　　What are the students in the room?

　　答案：What are the students doing in the room?

　　解析:現(xiàn)在進(jìn)行時態(tài)中對動作提問可記住此句式“What +be +主語+doing+其它?”

　　或簡寫為“What......doing......”?句式。

　　四、現(xiàn)在進(jìn)行時態(tài)的選擇疑問句中易忽視or后用現(xiàn)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連接的是兩個并列成分，動詞形式須一致。

　　過去進(jìn)行時

　　其結(jié)構(gòu)是助動詞be的過去形式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：表示過去某時正在進(jìn)行的狀態(tài)或動作。

　　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) 過去某階段持續(xù)進(jìn)行的動作 What were you doing during the holiday? 另外，在復(fù)合句中，若主要動作和背景動作是同時發(fā)生的，那么主從句都可用過去進(jìn)行時e.g. Jenny was reading while Danny was writing.

　　3) 常用的時間狀語

　　過去進(jìn)行時常與過去某一特定時間的狀語連用，如 last night, at that time, at noon yesterday, last Sunday 等。也有時沒有時間狀語，要通過上下文的暗示來確定用過去進(jìn)行時。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(yīng)用過去時。同　時，when表時間的同時性，"瑪麗在做衣服時"提供事情發(fā)生的背景，因此用過去進(jìn)行時。

　　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(dāng)……之時"。描述一件事發(fā)生的背景時，用過去進(jìn)行;一個長動作發(fā)生的時候，另一個短動作發(fā)生。句意為 "在她看報紙時，奶奶睡著了。"句中的 fell (fall的過去時)，是系動詞，后跟形容詞，如：fall sick。

　　做題時常見錯誤如下：

　　一、易把be+現(xiàn)在分詞記成be+過去分詞

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

　　答案：was talking

　　解析：過去進(jìn)行時與現(xiàn)在進(jìn)行時結(jié)構(gòu)上的區(qū)別體現(xiàn)在be動詞上。

　　二、丟掉be動詞或忘記把動詞變成現(xiàn)在分詞

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

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