in the front of 用在哪里

I sit in front of the classroom.哪里错了? 用in front of、in back of、in the front of和in the back of分别造四个句 the man in front of 用 below, under,in front of, in the front of,above,beside,beh in front of和in the front of 的区别 in front of,in the front of,before的区别 in the front of与in front of in front of与in the front of的区别? in front of和in the front of的区别 in the front of与in front of怎么使用? in front of与in the front of 的区别 选词填空。 in front of, in the front of