when his mother was not using ... onto it翻译这个句子,并解释一下时态

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/05/02 08:43:13

when his mother was not using ... onto it翻译这个句子,并解释一下时态
When he was a little boy, Christopher Cockerell once watched his mother turning the wheel of her sewingmachine with her hand.
“Wouldn't it work quickly if a machine turned the wheel for you?” he asked.
“I suppose it would,” said his mother, without paying any attention to him.
Christopher knew she always had a lot of work, and he wanted to help.In his bedroom there was a toy steamengine which his father had bought him as a gift.“I will make better use of it,” little Christopher said to himself.So, when his mother was not using her sewing-machine, he fixed the toy steam-engine onto it.When the job was finished , he was quite pleased, thinking his mother would like it.
“Very clever,” his mother said, when she saw it.Then she sat down and went on turning the wheel by hand.“I have been working like this for too many years,” she explained.
This taught Christopher the lesson that anyone who tries to improve anything has to learn: Many people don't like new ideas.

when his mother was not using her sewing-machine,he fixed the toy steam-engine onto it.在他妈妈不用锯木机时,他将他的玩具蒸汽引擎固定在了传动轮上.
这是一个典型地“当某事发生时,又发生了另一件事”的叙事写法,所以,过去时是必须的,至于使用进行时态的从句嘛,通常作为时间条件从句,表示在此状态或情况下,主句的动作开始并结束.
必须指出,这种句型中的进行时态通常不能用于瞬间动词,如果一定要使用进行时态,应该使用非瞬间动词或进行相应转换,你懂的.除非有特殊用途,如表示动作的反复发生.his mother was knocking the door,he did turn TV on.

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