My brother can see (a ball) on the floor 对括号提问 They are new watches 改为单数句

My brother can see (a ball) on the floor 对括号提问 They are new watches 改为单数句
My brother can see (a ball) on the floor 对括号提问 They are new watches 改为单数句

My brother can see (a ball) on the floor 对括号提问 They are new watches 改为单数句
What can your bother see on the floor?
This is a new watch.