。
Yumi studied English last night.
Literal
Yumi [topic-は] last-night English [object-を] study-[past-した].
Minimal past-tense sentence. ゆうべ ('last night') is written in hiragana here — Japanese writers choose between 夕べ (kanji) and ゆうべ (hiragana) freely for stylistic reasons. Hiragana softens the feel; kanji is more formal. No particle after ゆうべ because it's an intrinsically relative time expression.