----- ----- ----- ----- the term ,we always clean our classroom.在学期末,我们总要打扫教室.

----- ----- ----- ----- the term ,we always clean our classroom.在学期末,我们总要打扫教室.
----- ----- ----- ----- the term ,we always clean our classroom.
在学期末,我们总要打扫教室.

----- ----- ----- ----- the term ,we always clean our classroom.在学期末,我们总要打扫教室.
At the end of
在...末

at the end of 在...结束时

at the end of

We clean our classroom in the afternoon(改为现在进行时） We（are）（cleaning）our classroom now. It's the o'clock.(对划线部分{the o'clock}