There are some stcdents on the play ground. 转换为一般疑问句

are there any students on the playground?

There are some stcdents on the play ground. 转换为一般疑问句
Are there any students on the playground?

are there any stcdents on the play ground

转换成疑问句就是系动词提前，然后some变成any

但是有的特殊 比如 would you like some milk

在这个疑问句里面some 就不用变成any

Are there some stcdents on the play ground?

Are there any students on the play ground?

Are there any students on the play ground？