There is a boy (standing）{ under a big tree}?是不是现在进行时?并分别以（ ）{ }里内容进行提问.
问题描述：
There is a boy (standing）{ under a big tree}?是不是现在进行时?并分别以（ ）{ }里内容进行提问.
答
不是的。
对standing:What is the boy under the tree doing?
后面的：Where is the boy standing？
答
不是
what is the boy do under a big tree?
where is the boy standing?
答
是现在分词作状语 初中阶段就当现在进行时理解吧
what's a boy doing under a big tree
where is there a boy standing