This is the 466th most frequent Korean word.
않으면
"않으면" means "if not" or "if (someone/something) does not."
'않으면' is used here to express a conditional negative form meaning 'if you don't' studying.
공부하지 않으면 시험에 떨어질 거예요.
If you don't study, you will fail the exam.
'않으면' functions as a negating condition meaning 'if you don't' eating excessive amounts.
많이 먹지 않으면 건강을 유지할 수 있어요.
If you don't eat a lot, you can maintain your health.
'않으면' conveys a conditional action that explains the result 'if you don't' exercise.