do badly in / do one's best

• do badly in  ~ 에서(을) 못하다

I always do badly in mathematics.

She did not study, so she did badly on her test.

The basketball player did badly in the game because of his injury.

Do you get good grades in school?

> My grades are good except for history. I usually do badly in that class.

 

• do one's best  최선을 다하다

The teacher told him, "Just do your best!"

He did his best to stop the water.

Although I didn't win, I was happy because I did my best.

I'm not very good at math.

> Don't worry. Just study hard and do your best and you will do alright.