"海报在墙上"poster is on the wall前面要不要加上一个the?那个the有什么用?

Stick the poster on the wall.把这海报贴在墙上吧.问：动词Stick 怎么在开头作主语了? 有一个窗在墙上 是用 on te wall还是in the wall? 一些英语问题.在墙上,the wall前面用什么介词；bike前面用in还是on,I go Is there a poster on the wall?怎么回答? 在他们的墙上有一张地图.翻译：A map is on the wall of______classroom. 照片在墙上用的是on the wall?还是in the wall? a movie poster that is on the wall and is about mouster There______ a poster and four pictures on the wall ________ 墙上是什么?( )it on the wall? 这些照片在墙上用英文说是there are photos on the wall还是in the wall? 问下,英文窗户在墙上是On the wall 还是In the wall in the wall ,on the wall有什么区别