There beThere be句型专题句型专题How many apples are there on the tree?There are twenty apples on the tree.How many apples are there on the tree now?There are thirteen apples on the tree now.概念结构用法There be 句型表示“存在”“有”，其中be动词有时态和单复数变化。There be+主语（人或物名词）+地点看名词单数is复数are不可数的用is看名词There _ a doll in the toy box. A. is B. are There _ some bread on the plate. A. is B. are There _ a lot of green trees in thePark. A. is B. are There is a cat under the tree.There are two dogs under the tree.There is a cat and two d
