问题描述：
把these are my ruler改为一般疑问句后是什么?
还有这几道题：
this is her sister(变复数形式）
that is my dictionary(变为复数形式)
those are his books(变为单数）
还有这几道题：
this is her sister(变复数形式）
that is my dictionary(变为复数形式)
those are his books(变为单数）
问题解答：
我来补答展开全文阅读