they are playing basketball ( on the field)对括号提问.
问题描述：
they are playing basketball ( on the field)对括号提问.
答
很高兴能够在这里回答你的问题：
Where are they playing basketball?
他们正在哪儿打篮球?
对地点提问,用where
把疑问句放句首,后跟be动词,其它不变,就可以了