There are two shelves in my study.怎么把句子改为单数形式
问题描述：
There are two shelves in my study.怎么把句子改为单数形式
答
There is a shelf in my study.有一个书架在我的书房里
答
There is a shelf in my study.有一个书架在我的书房里，are变is， shelves变shelf
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答
There is a shelf in my study.
答
In my study, my shelf number is two