1、Part 1 Review：Past Continuous TenseSentence Pattern：S+was/were doing（+time expressions）.Time Expressions:at 6:00 yesterday morning;at that time;from 2:00 to 4:00 yesterday afternoonWhat was he doing at 9:00 yesterday morning?What was the boy doing from 6:00 to 9:00 last night?Lazy Goat was sleeping
2、on the meadow.Big big wolf and his wife came.While Lazy goat was sleeping on the meadow,big big wolf and his wife came.While：during a period of time （conj.）当当的时候的时候（连词）（连词）Part 2:While-clause in adverbial of time1.While sth was happening，sth happened.2.or While sb/sth was prep./adv，sth happened.3.当某
3、事情正在发生的时候，另一件事情发生了。4.当某人/事处于某种状态下，另一件事情发生了。5.（while从句为背景动作从句为背景动作,主句发生在从句过程之中）主句发生在从句过程之中）2.While sth be happening,another one be happening.(be should change with the tense)当一件事情发生的时候，另一件事情也同时正在进行。（while从句可以和主句互换位置，两个动作正在同时从句可以和主句互换位置，两个动作正在同时发生）发生）While he was doing his homework，the bell rang.While
4、 she was away，her friend helped me.Tips:While 引导的句子为从句从句，表示事情发生的背景动作。While从句从句中，出现实意动词时，表示一段时间，所以只能选择延续性 动词，用过去进行时过去进行时 短暂性动词：瞬间发生就结束短暂性动词：瞬间发生就结束 eg：come，arrive，die etc.延续性动词：动作发生后可以持续进行延续性动词：动作发生后可以持续进行 eg：eat，sing，live etc.Which one is the While-clause?Which one is the principle clause?Eg:He was
5、walking.A man stole his wallet.=While he was walking,a man stole his wallet.She fell down.She was climbing a ladder.=While she was climbing a ladder,she fell down.She was away.Her friend looked after her child.=While she was away,her friend looked after her child.Part 3:Lets learnHe burned himself w
6、hile he was cooking.A：You look upset.B：I had a bad day.A：Why？What happened？B:I burned myself while I was cooking.A:Im sorry to hear that.A：You look .B：I had a day.A：Why？What？B:A dog me while I was .A:Im to hear that.upset badhappenedbit delivering the mailsorryA：You look .B：I had a day.A：Why？What？B:
7、I myself while I was my fence.A:Im to hear that.upset badhappenedcutfixingsorryPart 4：Lets say：oral time！Here is a model:I was very upset yesterday.Because I had a very bad day.I lost my purse while I was shopping.I couldnt buy anything.I was really angry.What a bad day for me!While he was reading，s
8、he was cooking.While she was cooking，he was reading.Tips:两个动作同时发生，主从句调换位置，句意不变！主从句均选择进行 时，动词选择延续性动词！While he was sleeping，she was doing her homework.While we were waiting for the bus，it was raining.While I was walking，he was running.Part 5：Lets write！Part 6：Lets compare!When&While(初步了解)跟动词时，while后面只能跟延续性动词 -进行时；when既可以跟延续性动词，也可跟短暂性动词-进行时、一般过去时都可以！Eg：While/When he was singing，the lights went out.表示两个动作同时发生，用while更合适.Eg:While he was shopping,she was shopping.when除“当的时候”意义之外，还含有先后顺序可译为“一就”Eg:When I heard the news,I ran out of the room.
