他们在做什么?不过问题错了,应该是What are they doing?
答案的话么,
比如：
They are playing.
They are cleaning.
They are watching TV.
They are helping with each other.
如果改问题的话,所有的are都改成like
帮你省点事,我再写一遍.
They like playing.
They like cleaning.
They like watching TV.
They like helping with each other.