“I will do my best” (頑張ります)
- we use this expression when someone cheers us up or urges us to study hard for exams, etc. It is the often answer when someone tells you “good luck!”
- it is also used as an answer when you’re not sure if you could do something but want to try anyway.
A: Good luck on your test for tomorrow!
B: Thank you! I will do my best!
A: Do you think you can arrive before dinner time? We need to prepare the dessert.
B: I am not sure but I will do my best.