[The ruler画线] is in the pencil case.提问
问题描述:
[The ruler画线] is in the pencil case.提问
答
What is in the pencil case?
主语为物提问用What
答
whose the ruler in the pencil case.
答
对The ruler画线提问 ,说明要问什么在铅笔盒里
What is in the pencil case?