飛(ひ)行(こう)場(じょう) hikoujouに ni着(つ)く() tsukuと toすぐ sugu、切(きっ)符(ぷ) kippuを o忘(わす)れ()た() wasuretaこと kotoに ni気(き)が()付(つ)い()た() kigatsuita。 As soon as I arrived at the airport, I realized I had forgotten my ticket. Literal Airport [to-に] arriving [as-soon-as-とすぐ] ticket [object-を] forgot thing [to-に] noticed. 着くとすぐ uses と conditional for immediate sequence. 切符を忘れたことに気が付いた means 'noticed that I forgot my ticket.' ことに気がつく is the standard pattern for realizing something. traveltransportationnominalizer こと~と (conditional)
飛(ひ)行(こう)場(じょう) hikoujouに ni着(つ)く() tsukuと toすぐ sugu、切(きっ)符(ぷ) kippuを o忘(わす)れ()た() wasuretaこと kotoに ni気(き)が()付(つ)い()た() kigatsuita。 As soon as I arrived at the airport, I realized I had forgotten my ticket. Literal Airport [to-に] arriving [as-soon-as-とすぐ] ticket [object-を] forgot thing [to-に] noticed. 着くとすぐ uses と conditional for immediate sequence. 切符を忘れたことに気が付いた means 'noticed that I forgot my ticket.' ことに気がつく is the standard pattern for realizing something. traveltransportationnominalizer こと~と (conditional)