现在进行时与过去进行时概述(3)

　　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、把动词变成现在分词形式易出错

　　例：1、They are swiming.(swim)

　　2 、Jenny is plaiing(play)football.

　　答案：1.swimming 2 .playing

　　解析：动词变现在分词可有如下口诀:“一添一去y不变”. “一添”指双写规则;“一去”指去掉不发音字母e规则;“y不变”指要与名词变复数区分开。

　　二、丢掉be动词或忘记把动词变成现在分词

　　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:现在进行时肯定句的结构规律为: “be+现在分词,缺一不可”。这一点必须牢记。

　　三、对动词或动词词组提问时丢掉doing

　　例：1 、The students are singing in the room.(对划线部分提问)

　　What are the students in the room?

　　答案：What are the students doing in the room?

　　解析:现在进行时态中对动作提问可记住此句式“What +be +主语+doing+其它?”

　　或简写为“What......doing......”?句式。

　　四、现在进行时态的选择疑问句中易忽视or后用现在分词形式

　　例：孩子们在跑还是在跳?

　　Are the children running or jump?

　　答案：Are the children running or jumping?

　　解析: or连接的是两个并列成分，动词形式须一致。

　　过去进行时

　　其结构是助动词be的过去形式was/were +v-ing.

　　其句式变化仍然要在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：表示过去某时正在进行的状态或动作。

　　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) 过去某阶段持续进行的动作 What were you doing during the holiday? 另外，在复合句中，若主要动作和背景动作是同时发生的，那么主从句都可用过去进行时e.g. Jenny was reading while Danny was writing.

　　3) 常用的时间状语

　　过去进行时常与过去某一特定时间的状语连用，如 last night, at that time, at noon yesterday, last Sunday 等。也有时没有时间状语，要通过上下文的暗示来确定用过去进行时。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.

　　典型例题

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

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

　　答案C. 割伤手指是已发生的事情，应用过去时。同　时，when表时间的同时性，"玛丽在做衣服时"提供事情发生的背景，因此用过去进行时。

　　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，意为"当……之时"。描述一件事发生的背景时，用过去进行;一个长动作发生的时候，另一个短动作发生。句意为 "在她看报纸时，奶奶睡着了。"句中的 fell (fall的过去时)，是系动词，后跟形容词，如：fall sick。

　　做题时常见错误如下：

　　一、易把be+现在分词记成be+过去分词

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

　　答案：was talking

　　解析：过去进行时与现在进行时结构上的区别体现在be动词上。

　　二、丢掉be动词或忘记把动词变成现在分词

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

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