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[No. 1难点] 如何准确判断何时使用该时态。
判断一个句子是否用过去进行时，主要有三种依据：
①依据典型的时间状语有： at nine o'clock; last night; at this / that time yesterday; from 7 to 10 yesterday morning; the whole evening 等。
②晓知两个常见的句型：
a. 在句型“主语＋was / were + V-ing + when + 主语 + V-ed”中, 表示“短”时间的动作用V-ed; 表示时间“长”的动作用“was / were + V-ing”。
【例如】：
The students were reading when the teacher came in.
b. 在句型“主语 + V-ed / was (were) + V-ing + while + 主语 + was / were + V-ing”中，由于while只能用于指一段时间，所以从句中的谓语动词必须是延续性动词，用过去进行时；而主句中的谓语动词如果是延续性的，则用过去进行时，如果是短暂性的，用一般过去时。
【例如】：
While I was watching TV, my sister was doing her homework.
（watch和do都是延续性动词，故都用过去进行时）
While my mother was cooking, the telephone rang.
(ring是短暂性动词, 故用一般过去时)
③ 根据上下文的语境来确定动词的时态，是近年各类考试中命题的热点。
【例如】：
— You were out when I dropped in at your house.
— Oh, I was waiting for a friend from Nanjing at the train station.
[No. 2 易混点]一般过去时与过去进行时的不同点。
一般过去时与过去进行时是极易混淆的两种时态，要想准确地了解它们的区别，可以从以下几个方面进行比较。
① 时间状语不同
过去进行时常见时间状语在上面已作归纳，而一般过去时的典型时间状语有：yesterday (morning, afternoon, evening), last night(week, year等)，an hour ago, the day before yesterday, in 1999, long long ago等。
② 强调动作的角度不同
一般过去时强调动作的“发生”或状态的“存在”；而过去进行时强调动作“正在进行”的延续性。试体会：
I got up at six this morning.
今天早晨我六点钟起床。
My mother was doing some washing the whole day last Sunday.
上周日我妈妈一整天都在洗衣服。
③ 动词特点不同
静态动词只用于一般过去时，不用于过去进行时。这类动词常见的有：
(1)表示感觉的动词，如：feel, hear, see, smell, taste等。
(2)表示状态、感情的动词，如：be, hate, love, like等。
(3)表示心理活动的词，如:remember, understand等。
(4) 表示所属关系的动词，如：own, belong等。
一般过去时的谓语动词既可用延续性动词，也可用非延续性动词；而过去进行时的谓语动词只能用延续性动词。
④ 情感不同
一般过去时是对过去事实的客观描述，语气比较客观、肯定；过去进行时有时也可表示赞美、厌烦等情绪，带有描绘性和感情色彩。试体会：
My father came home late.
我父亲回来得很晚。(说明客观事实)
My father was always coming home late.
我父亲总是很晚才回来。
(带有埋怨情绪，指责某人的一贯行径)
练一练
I. 用括号内所给动词的适当形式填空。
1. — What you (do) at six this morning?
— I (water) those trees in the garden.
2. Yesterday I (write) a letter to my brother. I (write) a letter to Kate next week.
3. — What Peter (do) at this time yesterday?
— He (play) football with Simon. 4. My mum (cook) supper when I got home yesterday.
5. Last night Grandma (tell) us a story before we (go) to bed.
6. Those boys (listen) to American pop songs from seven to nine last Monday morning.
II. 单项选择，选择最佳答案。
1. We TV when the telephone .
A. watching, was ringing B. were watching, rang
C. watch, rings D. are watching, rang
2. The Reads lunch when I got to their house.
A. were having B. was having C. are having D. is having
3. When I got to the factory, the workers about the film.
A. are talking B. talked C. were talking D. have talked
4. What was Jim doing the teacher came in?
A. while B. and C. when D. but
5. I didn't think Simon saw me, he a sweater for his brother.
A. just chose B. was just choosing C. has just chosen D. had just chosen
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