Grammar · Verb endings
-아야 / 어야 해요, have to
Pattern
[stem] + 아야 / 어야 해요
This follows the same vowel rule as -아요/-어요: 가야 해요, 먹어야 해요, and 하다 verbs become 해야 해요. Literally it says 'only if I do it, it works', which is how Korean expresses 'must'. 돼요 can replace 해요 with the same meaning.
The mistake to avoid
'Do not have to' is not the negative of this. Say 안 -아도/-어도 돼요: 안 가도 돼요 'you do not have to go'.
Examples
Romanisation help
지금 가야 해요.
jigeum gaya haeyo.
I have to go now.
약을 먹어야 해요.
yageul meogeoya haeyo.
I have to take my medicine.
숙제를 해야 해요.
sukjereul haeya haeyo.
I have to do my homework.
내일 일찍 일어나야 해요.
naeil iljjik ireonaya haeyo.
I have to get up early tomorrow.