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Hard is both an adjective and an adverb. When it is an adverb, it means ‘needing or using a lot of physical or mental effort’. It goes after the main verb:

I studied hard for my exams but didn’t do very well.

We have worked hard all day.

The comparative and superlative forms are harder and hardest:

He didn’t get into the team this year. He’ll just have to try harder next time.

Not: He’ll just have to try more hard next time.

Right, children, who has worked hardest today?

Warning:

Don’t confuse hard with hardly. Hardly usually means ‘only just’ or ‘almost not’:

Every day I ran a lot and worked hard so that I would be prepared for the game.

Not: Every day I ran a lot and worked hardly.

(“Hard” from English Grammar Today © Cambridge University Press. Need grammar practice? Try English Grammar Today with Workbook.)
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