第七讲：There be 句型及句型转换专题语法专题详解There be句型There be 句型的用法：表示某个地方存在某物或某人，Be动词的单复数必须依主语的变化而变化。(单数is 复数are )如：There is a table in the room.房间里有一张桌子。There are some birdsin the tree.树上有很多鸟。一、There be 句型的结构：1.常见句型结构（一）There is+单数可数+地点状语如：There is a ruler on the desk. 书桌上有一把尺。 （二）There are+复数主语+地点状语 如：There are four apples on the tree. 树上有四个苹果。There are some flowers in the park. 公园里有许多花。（三）there is + 不可数名词 +地点状语 （即使有some 也是 单数）如：There is some water in
