I'm going to play football(变一般疑问句)

变一般疑问句：Are you going to play football？

be going to用于一般将来时，表示打算，计划去做某事。

假若把be going to句式变为一般疑问句，只要把be动词提到主语前即可。

例：

We are going to have an English class。（一般疑问句）

变成：Are you going to have an English class？