朝の電車はいつも混んでいる。
The morning trains are always crowded.
連休中は高速道路がひどく混む。
The expressways get terribly congested during the long holidays.
店が混まないうちに昼ご飯を食べに行こう。
Let's go and have lunch before the restaurant gets crowded.
道が混んでいて、約束の時間に遅れてしまった。
The roads were congested, and I ended up late for my appointment.