Unit 3What were you doing when the UFO arrived?SectionA(1a-1c)

学习目标 1.掌握本课重点单词和短语. 2.掌握过去进行时态.

3.掌握在过去进行时中,连词when,while引导 的时间状语 从句. 4.培养 学生团队合作和热爱科学勇于探索

的精神.

Peter’s mother

Peter’s father

Peter

Peter’s brother

Where is Peter’s mother? She is in the kitchen. What is she doing ? She is cooking dinner.

Where was Peter’s mother when I visited?She was in the kitchen. What was she doing when I visited?

She was cooking dinner whenyou visited.

Where is Peter’s father? He is in the living room. What is he doing ? He is watching TV.

Where was Peter’s father when I visited? He was in the living room.What was he doing when I visited? He was watching TV when you visited. .

Where is Peter? He is in the bedroom. What is he doing ? He is sleeping .

Where was Peter when I visited?He was in the bedroom. What was he doing when I visited? He was sleeping when you visited.

Where is Peter’s brother? He is in the bathroom. What is he doing ? He is taking a shower.

Where was Peter’s brother when I visited? He was in the bathroom.What was he doing when I visited? He was taking a shower when you visited.

Pair work:

Who Peter Peter’s mother Peter’s father Peter’s brother Peter’s grandfather

Where

What

Where was_______when Miss Wang visited? What was _____ doing when Miss Wang visited?

b a

c e f

Listening

Pair work

重点、难点分析 1. 过去进行时：表示在过去某一时间内正在 进行的动作。 构成：was / were + 现在分词 (其中was是am、is的过去式，were是are的 过去式) eg. 1) I was doing my homework then . 那时，我正在做作业。 2) He was cooking in the kitchen at 12 o’clock yesterday . 昨天12点，他正在厨房烧饭。

重点、难点分析 用法：1)过去进行时表现过去某一时刻正在 进行的动作。

eg. She was writing a letter when I came in . 我进来时，她正在写封信。 2)过去进行时还表示过去某阶段正在进行 的动作。 eg. They were waiting for you yesterday . 他们昨天一直在等你。

以when和while引导的时间状语从句

1)延续性动词和非延续性动词 延续性动词指动作可以延续一段时间， 而不是瞬间结束。 如：work、study、drink、eat等。 非延续性动词指动作极为短暂，瞬间结 束。 如：start、begin、hit、jump、knock等。

以when和while引导的时间状语从句

<2> while表示“在……的时候”、“在……期间”。 它强调主句的动作与从句的动作同时发生或主句的动 作发生在从句的动作过程中。while从句中必须是表示 动作或状态的延续性动词。如： The weather was fine while we were in Beijing . She called while I was out . 如

果主句的动作在从句的动作过程中发生，从句常 用进行时。如。 While we were swimming someone stole our clothes . Don’t talk so loud while others are working .

总结 1. when可指时间点，又可指时间段，从句

中可用延续性动词，也可用非延续性动词。 2. while总是指一个时间段，从句中必须用 延续性动词。