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The hunt went on for several weeks, but the puma was not cau

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The hunt went on for several weeks, but the puma was not caught. but前主句为什么不用完成时态
The hunt went on for several weeks, but the puma was not cau
这个句子是一个并列句,两个分句各自说明一个动作,并没有强调两个动作在时间上的先后关系,所以前面一个分句可以不用完成时态.
注意:
这里是一个并列句,逗号前后的两个部分叫做并列分句
下面这个句子:
I was reading when he came in.
这个句子中的I was reading才叫做主句,而when引导的是从句