She was playing the piano while I was reading the newspaper.

可以1。She hesitated for a minute and stood still while a tear or two fell on the worn red carpet。她迟疑了一会儿,呆呆地站在那儿,同时一两滴泪水溅落在那破旧的红地毯上了。2。“Della,”said he,“Let's put our Christmas presents away and keep'em a while…。””他说“德拉,咱们把圣诞礼物收好,先保存一段时间。…”这两句话中出现的while一词,用法不同。前一个作连词,意思为“与此同时”。后一个作名词,意思为“一会儿”。为了帮助同学们更好地掌握此词在各种语境中的用法,现做如下总结：一、while作名词用,表示“一会儿”“一段时间”1。She likes to lie down for a while after lunch。她喜欢午饭后躺一会儿。2。Coming to another country to study requires a big adjustment and it takes a while to fit in。来到另一个国家求学,需要花一段时间来适应。二、While作连词(1)引导时间状语1。We must strike while the iron is hot。趁热打铁。2。While she was listening to the radio,she fell asleep。她听着收音机睡着了。(2)引起让步状语从句,意思是“虽然…但是…。”、“尽管…但是…”(多放于句首)1。While he loves his students,he is very strict with them。。虽然他爱他的学生,可是他对他们很严格。2。While these experiments are interesting and useful,it is important to remember that they may not always tell us much。(BookIIIp125)虽然这些实验很有趣也有用,但是很重要的是要记住,这些实验也可能不会告诉你很多。(3)引起条件状语,意思是“只要”1。While there is life there is hope。只要生命存在,就有希望。2。While there is a way there is away。有志者事竟成。三、While作并列连词用,意思为“而,然而”,表对比。而but表转折。注意用心比较体会while与but的句中用意1。Some people waste food while others haven't enough。有些人很费粮食,然而有些人却吃不饱。2。The son was having a good meal at home,while the parents were working in the fields。儿子在家吃好饭而父母却在田里辛勤劳作。3。I ought to have helped her,but I never could。我本该帮她但没能。4。Honey is sweet,but the bee stings。蜂蜜很甜,但蜜蜂有刺蜇人。四。while,when,as的用法区别都译为“当…的时候”,区别为：when后的从句谓语动词既可是延续性动词,也可是短暂性动词,而且还可作并列连词,译为“这时”。但以下句型一定用when,作并列连词：句型A：be about to do…when…正要做…这时(发生另一事)句型B：was/were doing…when…正在…这时(发生另一事)句型C：had done…when…刚要做…这时(发生另一事)1。We were about to set out when it began to rain。我们刚要出发天突然下雨了。2。He had hardly sat down when his mobile rang。他刚一坐下手机就响了。3。I was walking along the bank of the river when I fell into it。我正沿河岸散步突然掉进水里。while后的从句谓语动词只能是延续性动词,强调主从句的两个动词同时发生；while也可作并列连词,表示两个动作的对比,译为“而”“然而”。as则表示两个变化中的动作的同时性,译为“一边…一边…”。1。While his mother was cooking in the kitchen,the boy fell asleep in the chair。(在一个延续动作过程中发生另一个动作)2。He hurried home,looking behind as he went。他匆匆回家,边走边往后看。