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副詞 ad. 1.（用作疑問副詞）什么時候，何時I'd like to know when they'll let him out. 我想知道他們什么時候放他. When did you last see Margaret？ 你上一次見到瑪格麗特是什么時候？ 2.（用作關系副詞，引導關系從句）當。
時There were times when I didn't know what to do. 有些時候我不知道該怎么辦才好. 連接詞 conj. 1.當。時John got engaged to her when travelling last winter. 去年冬天旅行時，約翰與她訂了婚. Don't get excited when you talk. 你說話時別激動. 2.既然，考慮到How can he get the promotion when his boss dislikes him？ 既然上司不喜歡他，那他怎么會獲得提升呢？ 3.雖然，然而I had only fifteen dollars on me when the book I wanted cost twenty. 我身上只帶了十五元錢，可是我想買的那本書定價二十元. 4.在那時，然后代詞 pron. 1.什么時候，那時Since when has she taught here？ 她從什么時候開始在這兒教書的？ 名詞 n. 1.（事件發生的）時間[the S]。
2. when 做并列連詞和從屬連詞的時態區別
從屬連詞通常用來引導名詞性從句和狀語從句.后面緊跟從句，如when,after,because并列連詞一般用來連接兩個并列的句子，如；but,so,and.主要講when.當能翻譯成“當.的時候”時，是從屬連詞；翻譯成“（正在）這時.”時，是并列連詞.如：I'll ring you up when I get to Beijing.（從屬連詞）We were playing football yesterday when it began to pour rain.（并列連詞）。
3. 用連詞when句型寫10句
I am watching TV when the door bell rings.
John was talking to the phone when his father came home.
Mary came into the kitchen when her mother was cooking.
I like listening to music when there is no one at home.
It started to rain when Peter wanted to go out.
Ask the teacher again when you can hear her well.
My mobile phone rang when I was watching TV last night.
You should return the book to the library when you finished reading it.
The teacher came into the classroom when we were talking.
Give me a call when you need my help.
My family was sleeping when the heavy rain came.
My dog will bark when he is hundry.
4. 關于when的句式有什么
在學習英語中， 我們經常見到與并列連詞when相關的句式，現將其歸納如下： 1. be (just) about to do。
when。 She was just about to say something more when she noticed the sullen look on his face. 她剛要再說些什么， 卻突然看到了他陰沉的臉色。
We were about to telephone you when your telegram arrived. 我們正準備給你打電話， 這時你的電報來了。 2. be (just) on the point of doing sth。
when。 They were on the point of giving up when the captain encouraged them fiercely to save the ship. 就在他們快要放棄努力時， 船長鼓勵他們竭盡全力挽救輪船。
The coach was just on the point of giving up the game when our team scored two points. 教練正準備放棄比賽， 這時我們隊得了兩分。 3. be going to do。
when。 He was going to run away, when the policemen came. 他正打算逃跑， 警察突然出現了。
She was going to open the window and shout at the dog to frighten it, when she stopped and stood quite still. 她正準備打開窗戶， 大聲嚇唬一下那條狗， 這時她突然停住了， 站著一動也不動。 4. be doing sth 。
when。 The children are playing football on the playground, when it began to rain. 孩子們正在操場上踢足球， 突然下起了大雨。
A few days later, I was moving forward over a slope that seemed safe when suddenly without warning my world dropped out from under my skis.（必修本SEFC Book 1 Unit 17） 幾天以后， 我正在一個似乎安全的斜坡上前行， 突然， 毫無預兆， 滑雪板下的大地陷下去了。 5. be busy doing。
when。 I was busy doing my homework when one of my classmates came. 我正忙著做作業， 這時我的一個同學來找我。
I was busy cooking when there was a knock at the door. 我正在忙著做飯， 突然聽到了敲門的聲音。 6. had (just) done。
when。 I had just gone to bed after a very hard day when the phone rang. 在勞累了一天之后， 我剛要上床睡覺， 這時電話響了。
I had travelled only two hours one day when the winds increased so much that I had to put my tent up before the winds became too strong. （必修本SEFC Book 1 Unit17） 一天， 我剛走了兩個小時， 突然狂風大作，我只好趁風力還不算太大之前， 支起帳篷。 7. had not done。
when。 I hadn't walked a few steps when I realized that he asked for the direc-tion to my office building. 我還沒走出去幾步遠， 突然意識到他問的是去辦公大樓的方向。
The students hadn't played basketball long when the bell rang. 學生們沒玩多長時間籃球， 鈴就響了。 8. be + 介詞短語 + when。
He was on his way to a lecture when a tourist stopped him and asked him for directions. 在他去聽課的路上， 一名游客攔住他問路。 The mother and the seven-year-old were inside the house when the shooting occurred. 這位母親和她7歲的孩子正在家里的時候， 發生了槍擊事件。
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