问题描述：
肯定式：there（ ）some books on the shelves
否定式：there（ ）【isnt】a bag on the desk.
there（ ）【arent】any books on the shelves、
疑问式简略回答：（ ）there a bag on the desk?yes,there（ ）.
( )there any books on the shelves?
yes,there( ）.No,there( )
否定式：there（ ）【isnt】a bag on the desk.
there（ ）【arent】any books on the shelves、
疑问式简略回答：（ ）there a bag on the desk?yes,there（ ）.
( )there any books on the shelves?
yes,there( ）.No,there( )
问题解答：
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