unit 1 success stories
the past continuous tense过去进行时态用法
1. actions happening at a particular time in the past 过去某个时候在进行的动作
2. two continuing actions in the past. 两个过去某时在持续进行的动作
he was practicing the piano while other children his age were playing games and having fun.
3. contrasting continuing and complete actions in the past. 对比过去某时在持续和已经完成的动作
he was watching a tom and jerry cartoon on television at 8:00 pm last night.
he was watching a tom and jerry cartoon on television when he first heard western classical music.
while & when的区别:
while to link two continuing actions 连接两个持续进行的动作，可以翻译为“正在这时”
句型结构：s1+ was/ were doing + while +s2 + was/ were doing.
he was practicing the piano while other children his age were playing games and having fun.
when to link longer, continuing actions with shorter, com
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Unit 12 What’s the best radio station ?