Question

연습을 못 했어요 못 is a negative word expressing inability to act in circumstances where the subject has no control over the situation. Meanwhile, 안 can be used to express a deliberate choice of the subject not to act. This choice is made regardless of ability or external conditions.Unlike 안, 못 is not used to negate adjectives. However, the long negation -지 못하- can be used with adjectives. 못 cannot be used with the copula -이다.The long negation form of 못 is -지 못하-.

Accepted Answer

I could not practice. [It was too noisy.]

Front	연습을 못 했어요
Back	I could not practice. [It was too noisy.]
Notes	못 is a negative word expressing inability to act in circumstances where the subject has no control over the situation. Meanwhile, 안 can be used to express a deliberate choice of the subject not to act. This choice is made regardless of ability or external conditions. Unlike 안, 못 is not used to negate adjectives. However, the long negation -지 못하- can be used with adjectives. 못 cannot be used with the copula -이다. The long negation form of 못 is -지 못하-.

못 Subject Choice Adjectives Long Negation 지 연습을