Is he watering the flowers in the park?
肯定句改一般疑问句的方法——三步法
1、 把be动词放在句首,剩下的照抄,（some 改成any,my改成your等）句点改成问号.
2、 把can,shall, will等放到句首,剩下的照抄,（some 改成any,my改成your等）句点改成问号.
例如： 陈述句: They are in the park. He can play the guitar..
一般疑问句: Are they in the park? Can he play the guitar?