in the early (hours of) morning
朝早く［早朝，未明］に
in the early 20th century
２０世紀初頭に
in the early days [years] of ...
…の最初の何日［年］間
in the east of China
中国の東部（地帯）で
in the eighteen hundreds
１８世紀に
in [at] the end of the year
１年の終わりに
in the evening
夕方に，晩に
In the event of fire, don't use the elevator.
火災のときはエレベーターには乗らないこと
in the event of his death＝((主に米))in the event that he dies
彼が死んだ場合には
In the event that you can't make it, please call.
来られなかったらご連絡ください（◆in the event that ... は否定的文脈をつくり，それに続く節の中ではsomeでなくanyが用いられる：In the event that th...
