When did they go out to play?


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祝学习进步what were you doing,when they wen out to play? 可以吗？为什么要那么写？要改主句还是从句?(When i was doing my homework in the classroom),这部分要想象是未知的， 故用When,再把主句的语序改一下即可就是说，该主句就OK了？ 有点啰嗦，sorry是的， 因为从句是未知的