Yes, I cleaned my room and washed my clothes.

是的，我打扫了房间，还洗了衣服。

I cleaned my room and washed my clothes on Saturday.

我星期六打扫了房间并洗了衣服。

It was by myself that I washed my clothes at home last night.

是我自己在家里洗衣服或昨晚在家里洗衣服的是我自己。