Question

ls there a picture on the wall?的肯定回答是什么?

Answer 1

Is there a picture on the wall?有一幅图片在墙上吗？
肯定回答是是的。用英语说就是Yes,there is.告诉你：一般加not的是否定回答，No,there isn't.不是。
保证正确率，谢谢！

Answer 2

Yes,there is,

Answer 3

Yes, there is./No, there isn't.