[答案]
Theyareplayingwitheachother.
[解析]
首先根据所给词汇及标点,可确定组合的句子为现在进行时的陈述句,组合的句意:他们正在互相玩耍。They他们,作主语,放于句首;are playing with 正在和……一起玩耍,是动词短语的进行时,放于主语后;each other互相,是固定搭配,放于句末,结合整句及英语表达的习惯作答。
故答案为:They are playing with each other.
[点评]
本题考查了"陈述句肯定形式,",属于"常考题",熟悉题型是解题的关键。