when he was waiting for the bus,he saw a dog.改错怎么改,为什么?

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将when 改为while !
解析：while引导的时间状语从句多用进行时态,而when引导的时间状语从句多用一般时态.
例如：1、While I was writting a letter,the telephone rang.
2、I was just reading a book when she came into my room.
再问：还有别的改法吗？
再答：没有了：）就这一种改法。这里主要是考察while和when 的区别。
再问：那可以改成when waiting for the bus ,he saw a dog.吗
再答：改错一般仅需改一处，所以依然建议将when改为while 。不过您说的when waiting for the bus ,he saw a dog 这句话还是最好把when换成是while 。因为while一般是用在谓语动词是延续性动词的情况下。

when he was waiting for the bus,he saw a dog.改错怎么改,为什么? when the little boy saw the dog ,he was a----- While he was waiting for the bus,he was reading a newspaper. While he was waiting for the bus, he was reading a newspaper He was ___ ___ the bus when he saw a thief. he saw a dog near the rive yesterday,改一般现在时英语翻译While waiting for a bus to the office where he was suppo the bus he was waiting for over half an hour arrived only a When he is waiting for the bus,he takes his turn.He doesn't 改错：For the first time I saw him,he was only a little boy He stands here waiting for the bus 改错.He is waiting for his turn get on the bus._______