李明在树的后面用英文怎么说

"Li Ming is behind the tree" 或者 "Li Ming is at the back of the tree"。

这句话的来源是简单的英语结构，在表示人物和物体之间的位置关系时常用。

例句:

"The cat is behind the couch." (猫在沙发后面)
"I saw him behind the building." (我在建筑物后面看到了他)
"The kids are playing behind the school." (孩子们在学校后面玩)