eoseo
because; and then
Used to give a reason, or to connect two actions in order.
Rule: Choose -아서 after a stem with ㅏ or ㅗ (가서, 좋아서), -어서 elsewhere (먹어서), and 해서 for 하다 verbs. Never add a tense marker before it, and never use it before a command or suggestion — use -으니까 for those.
배가 고파서 밥을 먹었어요.
I ate because I was hungry.
늦어서 죄송해요.
Sorry I'm late.
카페에 가서 공부했어요.
I went to a cafe and studied.
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