On Saturday morning,the students are cheaning the library.
星期六早上,学生们在打扫图书馆.
如果on的首字母不是大写,还可以是:The sutdents are cleaning the library on Saturday morning.学生们在星期六早上大赛图书馆.
On Saturday morning,the students are cheaning the library.
星期六早上,学生们在打扫图书馆.
如果on的首字母不是大写,还可以是:The sutdents are cleaning the library on Saturday morning.学生们在星期六早上大赛图书馆.