How many changes________(take)place in your village since 20

How many changes________(take)place in your village since 20 How many ______ (家庭)are there in the village? since引导的主句使用的必须是持续动词吗?many changes____(take) place since the how many students _____ in your class? how many peoples in your family? how many rooms are there in your "How many student in your classroom? How many playgrounds in your school?改错 How many students __ in your class? --How many students are in your school? how many pupils in your class? how many pupils are in your class