hard 副词‘ 努力地’ ，形容词‘ 困难的，硬的’此时与difficult 同义

hardly 副词‘几乎不’

如He works hard at English .

The maths problem is so hard/ difficult that few students can work it out .

He hardly study . 他几乎不学习。

ended 是end 的过去式，动词

over 副词

School ended at four yesterday.

School was over at four yesterday .

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