the beggar stood on his head and sang songs在这句话里为什么介词用on,用in

the beggar stood on his head and sang songs在这句话里为什么介词用on,用in he stood on his head and sang songs he stood there on his head,and he held on to the side of the At the end,we sat in pairs and sang some songs.这里为什么不用in the The boy stood up h_____ his head on the low ceiling. on the telephone 介词为什么用on he washes and puts on his new clothes 为什么用on,而不用其他介词 'zhang li stood at the door with his head down'中为什么要用with? 新概念4里的问题L6里有句话At the international level,.这里为什么介词用AT不用in 或on the doctor give him some advice on his illness.这里为什么用介词on? he put his head on the desk and said in,at和on有什么区别 on the campus在校园里不是要用in为什么用on?