Can you tell me how many students ( ) in your class? A there

A从句要用陈述语序。因为疑问词不是作主语的,本句有自己的主语students,所以用陈述语序。例如:Can you tell me what is on the box。什么东西在盒子里,what 作主语,语序不变。what's the matter,what's happened等不改变其语序。