PPT预览
when与while的用法匹别 when“当……的时候”,是at that time的意思,表示做某种动作的时间或瞬间。常与一般现在时或一般过去时连用。 When winter comes, the weather gets colder and colder.当冬天来临时,天气变得越来越冷。 When Linda saw Davy, he was jumping with another dog.当Linda看到Davy时,他正和另一只狗一起蹦跳着。 while“当……的时候”,是during the time的意思,表示略长的一段时间。常与现在进行时或过去进行时连用。 Mr. White was reading a newspaper while he was waitingfor a bus.怀特先生边等车边看报。 l am doing my homework while my mother is cooking.我做作业的时候,我妈妈在做饭。