the boy does not often play football.
问题描述：
the boy does not often play football.
the boy does not often play football.
（just now）改为过去式
there is not a pen on the desk…
（a month ago）改为过去式
答
The boy didn't play football just now.
那个男孩儿刚刚没有踢足球.
、There was not a pen on the desk a moth ago.