once

一度、一回

一回だけ。

やさしい英語で： One time only.

• I have been there once.
• We meet once a week.
• Please say that once again.

使い方： once a day/week/month (We water the plants once a week.)

類義語： one time

よく使う表現： only once, once again, once a week

かつて、昔

過去のある時に。今は違う場合によく使う。

やさしい英語で： At a time in the past, although usually no longer true.

• This building was once a school.
• I once knew a man who kept snakes.
• She was once very famous.

類義語： formerly, previously

よく使う表現： once famous, once lived, once knew

〜したら、〜すると

何かが起きたり、ある状態になったりした後のことを表す。

やさしい英語で： After something happens or becomes true.

• Once you finish, you can leave.
• Call me once you get home.
• Once she understood the rules, the game was easy.

使い方： once + clause (Once the rain stops, we can go outside.)

類義語： after, as soon as

よく使う表現： once ready, once you finish, once it arrives

〜したら、〜した後

ある出来事や行動が終わった後であることを表す。

やさしい英語で： After a particular event or action has happened.

• Once finished, the cake needs to cool.
• Once back home, we unpacked our bags.
• Once the work is completed, we can relax.

使い方： once + clause (Once I have packed, we can leave.); once + past participle (Once signed, the agreement cannot be changed.)

類義語： after

よく使う表現： once finished, once completed, once back home

一度、一回

示された期間の中で一回であることを表す。

やさしい英語で： One time in a stated period.

• We go swimming once a week.
• She visits us once a year.
• Take this medicine once a day.

使い方： once a day/week/year (They meet once a month.)

類義語： one time

よく使う表現： once a day, once a month, once a year

かつて、昔

以前はそうだったが、今は違うことを表す。

やさしい英語で： At an earlier time, but no longer now.

• We were once friends.
• She was once a teacher here.
• This quiet village was once a busy port.

類義語： formerly, previously

よく使う表現： once friends, once wealthy, once a teacher