when he was free often lay on the sofa为什么要用lay？

She lay on the sofa，（watching） TV programs. 请问 是~

这是英语语法中的非谓语动词的用法，doing表示主动/进行,watch与主语she之间是主动的关系

答案是itself

同学好！ when he was free often lay on the sofa .

         当天他空闲的时候，他常常躺在沙发上面。

你所给的句子出现错误少了主句的主语 he,此外，状语从句和主句之间要用逗号来分开才对。这是个复合句，句中有时间状语从句和主句。主句是 he often lay on the sofa. ，时间状语从句是When he was free

正确句子如下：

When he was free,he often lay on the sofa.

为什么要用 lay 呢? 因为 lay 是躺 (lie) 的过去时。前面时间状语从句的谓语was free是过去时态，后面主句的时态和状语从句的时态要保持一致，所以用lay .

因为从句说的是当她有空的时候用的是一般过去时，所以这个lay就是lie的过去式。

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