could you swim when you were eight years old

问题描述:

could you swim when you were eight years old
为什么这里的were不用原型,could不是情态动词吗?
1个回答 分类:英语 2014-10-29

问题解答:

我来补答
额,这是个复合句啊,所谓复合句就是俩个句子由一个连词合并为一个复杂句.
因此,会分成主句和从句.而主从句分别有各自的主语,动词.
这里Could you swim是主句
you were eight years old是从句,中间由when连接.
因此,could只能管前面的swim,管不了后面的be动词
 
 
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