What did you do yesterday? 昨日何をしましたか？

To talk about a finished action in the past, use the past simple. Most verbs are regular: just add "-ed" — watch → watched, visit → visited, cook → cooked, play → played. (Spelling: like → liked; study → studied.) But many of the most common verbs are IRREGULAR — each has its own past form you must memorise: go → went, eat → ate, see → saw, have → had, buy → bought, make → made, come → came, get → got, take → took. Use the past with time words like yesterday, last night, last week, and "two days ago": "I saw a film last night." To ask or say no, use "did / didn't" with the plain verb: "Did you go?" "I didn't go." Korean makes the past with one regular ending on every verb, so learners add "-ed" to irregular verbs too: "I goed home and eated dinner" ✗ → "I went home and ate dinner" ✓.

過去に終わった動作を話すには過去時制を使う。多くの動詞は規則的：「-ed」を足すだけ — watch → watched, visit → visited, cook → cooked, play → played。（つづり：like → liked; study → studied。）だが最も一般的な動詞の多くは不規則 — それぞれ覚えるべき過去形がある：go → went, eat → ate, see → saw, have → had, buy → bought, make → made, come → came, get → got, take → took。過去は yesterday, last night, last week,「two days ago」などの時間語とともに使う:「I saw a film last night.」尋ねる・否定するには「did / didn't」+ 動詞の原形:「Did you go?」「I didn't go.」韓国語はすべての動詞に同じ規則語尾で過去を作るので、学習者は不規則動詞にも「-ed」を付ける:「I goed home and eated dinner」✗ →「I went home and ate dinner」✓。