三个“There be”句型分析

各自分析一下“There is a dog”,“There is a dog under the tree”和“There is a dog sitting under the tree”~貌似是不同的语法现象~

第一句就是简单的THERE BE 句型。。不用说吧??呵呵

第二句UNDER THE TREE是地点状语。。。跟at school差不多

第三句可以看作是定语从句省略主语。。
there is a dog which is sitting under the tree
因为主语是狗可以省略
There is a dog sitting under the tree
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