Learn Hardcore Korean: yemaehaji anheumyeon misulgwane mos deureogayo. - If you don’t reserve, you can’t enter the art museum.

Attach -지 않으면 to a verb stem to mean if you don’t [verb]. It’s built from -지 않다 (negative) + -으면 (if). So 예매하지 않으면 means if you don’t reserve.

Why is 못 used before 들어가요 instead of 안?

못 expresses inability (“cannot”), while 안 is simple negation or choice (“don’t”). Here the intended meaning is “cannot enter,” so we use 못 들어가요.

Is 예매하지 않으면 미술관에 못 들어가요 a double negative, and does it cancel out?

No. The first negative (-지 않으면) sets a condition (“if you don’t…”), and 못 marks inability in that condition. They don’t cancel; together they mean “if you don’t do X, you won’t be able to do Y.”

Why is 미술관에 used with 들어가다? Couldn’t it be 미술관에서 or 미술관으로?

When you talk about entering or going into a place, Korean uses the destination particle -에 with 들어가다. -에서 would indicate the location where an action happens (“at the museum”), and -으로 can mark direction but is less natural here for “entering.”

What’s the difference between 들어가다 and 들어오다?

들어가다 means “to go into” (movement away from the speaker’s position), whereas 들어오다 means “to come in” (movement toward the speaker). In a general sense of admission, 들어가다 is used.

What level of speech is the -요 ending in 들어가요?

The -요 ending is the polite informal style (해요체). It’s respectful enough for everyday conversations but is not the highest honorific form.

Why isn’t there an object marker like -를 after 예매 in 예매하지 않으면?

In Korean, the object particle -를 can be omitted when the object is clear, especially in casual or spoken language. You could say 예매를 하지 않으면, but dropping -를 is more natural and common here.