They were sitting by the river分析一下这句话,特别是were sittingsit 为什么要加ting，有什么意义或者说用到了什么样的语法

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Theyweresittingbytheriver分析一下这句话,特别是weresittingsit为什么要加ting，有什么意义或者说用到了什么样的语法Theyweresittingbytheriv

They were sitting by the river分析一下这句话,特别是were sittingsit 为什么要加ting，有什么意义或者说用到了什么样的语法
They were sitting by the river
分析一下这句话,特别是were sitting
sit 为什么要加ting，有什么意义或者说用到了什么样的语法

They were sitting by the river分析一下这句话,特别是were sittingsit 为什么要加ting，有什么意义或者说用到了什么样的语法
他们正坐在河边.过去进行时,表示过去某一时刻发生的动作.

他们正坐在河边。这是过去进行时，至于为什么用这个时态得联系上下文来理解。你这里单独列出一个句子，无从着手分析啊。
They（主语） were（谓语） sitting by the river（宾语）

过去进行时嘛，个人认为跟一般过去时的不同是持续时间长。。。

他们坐在河边。
were sitting , 是过去进行时
补充：如果你要用sit，那就直接用they sitted by the river. 一般过去式，他们在河边坐过。
至于到底用那种时态，是看上下文的，如果你描述的是一副照片，或者是讲诉过去发生的事情，一般用were sitting.

这句话的意思是：他们坐在河边，用的是过去进行时态
这里they是复数，所以在be动词的选择上用were，后面跟doing(sitting).这是过去进行时态的结构

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