【題目】用when/while填空。
(1)He was listening to music he was riding his bike.
(2)I was waiting at the lights I saw the boy fall off his bike.
(3)I was walking in the street I saw the accident happen.
(4)The driver was talking on his mobile phone he was driving.

【答案】
(1)while
(2)when
(3)when
(4)while
【解析】when和while的區(qū)別:when引導(dǎo)的從句可以用一般時態(tài)也可以用進行時態(tài);while引導(dǎo)的從句只能用進行時態(tài)。when有兩個意思:①當……的時候,②這時,那時;while正當……的時候。
(1)句意:他正騎自行車的時候聽音樂。前后都用進行時態(tài),用while。
(2)句意:我正在等紅燈,這時我看見那個男孩從自行車上摔下來。表示這時,用when。
(3)句意:我正在街上走,這時我看見一起事故發(fā)生了。表示這時,用when。
(4)句意:司機打電話的時候正開著車。前后都用進行時態(tài),用while。

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