点拨：{#blank#}1{#/blank#}意为"当……时候"，后面通常接时间点，从句中谓语动词用短暂性动词。另外，while，意为"当……时候"， 后面只能接一段时间，不能接时间点，其引导的从句的动作或状态往往与主句的动作同时发生。

While we were walking home, it began to rain.＝ {#blank#}2{#/blank#}

    Colin Boyle was born in 1973．near Dublin，Ireland．While he was ill in hospital at age 10,his uncle gave him an old violin．He loved it right away．After he left the hospital，he practised at his school every day after class．

One day in 1987，John Leaf,the manager of several Successful musicians．came to Colin's school．He was having a meeting with the head teacher when he heard Colin practising．After the meeting．he found Colin and invited him to appear in one of the concerts he was organising (组织)that year．Colin．however,didn't accept Leaf's invitation because lust then he was preparing for some important school exams．Years later,Colin made it to college to study．At college he met Kim O'Malley,who was studying chemistry(化学)．Kim was also good at music．Being students，they didn't have much money and they usually worked in a restaurant at weekends．

    One evening in April 1992．while Colin and Kim were at work，they heard that there would be no live(现场演出的)music in the restaurant that night because the singer could not come．Colin and Kim persuaded the owner of the restaurant to let them play．Everyone was surprised to hear how good they were．After that，they worked hard together and improved greatly in music．

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