彼(かの)女(じょ) kanojoは wa入(い)り()口(くち) irikuchiで de若(わか)い() wakai男(おとこ) otokoを o見(み)た() mita。 She saw a young man at the entrance. Literal She [topic-は] entrance [at-で] young man [object-を] saw. Plain transitive sentence. で marks the location of the seeing-action ('at the entrance'). 入り口 ('entrance, doorway') is a useful spatial noun — 入る ('enter') + 口 ('mouth, opening'). young mendoors and entrywaysで (means/circumstance)
彼(かの)女(じょ) kanojoは wa入(い)り()口(くち) irikuchiで de若(わか)い() wakai男(おとこ) otokoを o見(み)た() mita。 She saw a young man at the entrance. Literal She [topic-は] entrance [at-で] young man [object-を] saw. Plain transitive sentence. で marks the location of the seeing-action ('at the entrance'). 入り口 ('entrance, doorway') is a useful spatial noun — 入る ('enter') + 口 ('mouth, opening'). young mendoors and entrywaysで (means/circumstance)