The children chortled all the time while they were hearing the story.The children were chortling all the time while they were hearing the story.The children chortled all the time while they heard the story.怎么就不行?语法不对吗?还是

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Thechildrenchortledallthetimewhiletheywerehearingthestory.Thechildrenwerechortlingallthetimewhilethe

The children chortled all the time while they were hearing the story.The children were chortling all the time while they were hearing the story.The children chortled all the time while they heard the story.怎么就不行?语法不对吗?还是
The children chortled all the time while they were hearing the story.
The children were chortling all the time while they were hearing the story.
The children chortled all the time while they heard the story.
怎么就不行?语法不对吗?还是都可以 只是意思不一样?

The children chortled all the time while they were hearing the story.The children were chortling all the time while they were hearing the story.The children chortled all the time while they heard the story.怎么就不行?语法不对吗?还是
while这时引导的时间状语从句表示的是在“.从句动作的过程中,主句的动作发生了”,所以时间状语从句用进行时态表示一个过程,而主句是表示一个动作而已.