组成句子：found a they standing boy the door at .
问题描述：
组成句子：found a they standing boy the door at .
答
they found a boy standing at the door
答
They found a boy standing at the door.
答
They found a boy standing at the door.
意为“他们发现一个男孩站在门旁”
find sb.doing sth 发现某人正在做某事