1-------What is behind that tree -------There mu

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1-------What is behind that tree -------There mu
1-------What is behind that tree
-------There must be a dog (sitting) behind it .
2.The telephone (inventing) by Alexander Bell is useful for people.
问:为什么1句sit要用现在分词?为什么2句invent要用ing形式?

1.(sitting) behind it 是现在分词短语作后置定语的,我们知道,现在分词是表主动,进行的.可以改为：
that/ which is sitting behind it
2.inventing 不对,应该是invented,因为其逻辑主语The telephone (电话）是invent(发明）所表动作的承受着,表被动,完成要用过去分词作定语
= which was invented

1-------What is behind that tree -------There mu there that girl behind the tree? What's behind the house?_____a tree.A.There is B.There are C look what is--------- there the tree what is that next to the tree there is a big old tree behind my house和there was a big old What’s in that tree?——There are some birds in that tree. There is a dog behind the tree.用cat改为选择疑问句 cat,tree,a,there,the,is,behind(连词成句） There is a tree behind the house ,____________?改反意疑问句急,快昂! Is there a big tree behind the house?(改为否定式的陈述句） What it is that always behind time?(谜语)