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Grammar detail: いったん

いったん
once you do ~
53 words
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いったん
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verb conditional form
means
once you do ~
Several forms of conditional verb are acceptable, such as the standard ば conditional:
いったん
かいてき
快適
な
せいかつ
生活
すれば
、お
かね
金
がなかった
じき
時期
のことを
わす
忘
れる
だろう。
Once you live comfortably, you'll forget about the period when you didn't have money.
いったん
やくそく
約束
した
のであれば、
まも
守
らなければならない
。
Once you have made a promise, you must keep it.
いったん
し
知
り
あ
合
えば
、とても
しんせつ
親切
な
ひと
人
です。
Once you get to know her, she is very friendly.
The たら conditional:
きみ
君
はいったん
はじ
始
めたら
、
つづ
続
けなければいけません
。
Once you begin, you must continue.
いったん
やくそく
約束
をしたら、
まも
守
らなくて
はいけない。
Once you have made a promise, you should keep it.
いったん
かれ
彼
と
はな
話
したら
、きっと
かれ
彼
を
す
好
き
になるでしょう。
You'll like him once you've had a chance to talk to him.
Or a verb in plain form + と:
かのじょ
彼女
はいったん
はな
話
し
はじ
始
める
と
と
止
めど
がない。
Once she starts talking, she is hard to stop.
わる
悪
い
しゅうかん
習慣
はいったん
み
身
につく
と、
ぬ
抜
け
だ
出
す
のが
むずか
難
しい
ことがある。
Once you've got into a bad habit, it can be difficult to get out of it.
The kanji form (less frequently used) is 一旦.
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Kanji used in this grammar

一
イチ   イツ   ひとつ    ひと- one   
旦
タン   ダン    dawn   
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快
カイ   こころよい comfortable, pleasant, refreshing   
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適
テキ    suitable   
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生
セイ   ショウ    life   なま raw   いかす to enliven   いきる to live   いける to arrange flowers   うまれる to be born   うむ to give birth to   き pure, undiluted   おう to grow, to sprout   はえる to grow, to sprout   はやす to grow, cultivate   
活
カツ    activity, resuscitation   
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金
キン   コン   かね gold; money   
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時
ジ   とき time, occasion   
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期
キ   ゴ    period of time   
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忘
ボウ   わすれる to forget   
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約
ヤク    promise; approximate   
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束
ソク   たば bundle   たばねる to tie in a bundle   
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守
シュ   ス   まもる to protect, guard   もり babysitting   
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知
チ   しる to know   
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合
ゴウ   ガッ   カッ   あう to fit, come together   あわす to match   あわせる to unite, join   
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親
シン   おや parent   したしい close, intimate   したしむ to befriend, grow close to   
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切
セツ   サイ   きる to cut   きれる to break, to snap   
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人
ジン   ニン   ひと person   
君
クン   きみ you   
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始
シ   はじめる to begin, to start (something)   はじまる to begin, to commence   
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続
ゾク   つづく to continue   つづける to carry on with   
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彼
ヒ   かれ he   
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話
ワ   はなす to talk   はなし talking   
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好
コウ   このむ    すく to like   
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女
ジョ   ニョ   ニョウ   woman; female   おんな woman   め woman   
止
シ   とめる to stop   とまる to stop   
悪
アク   オ   わるい bad   
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習
シュウ   ならう to learn   
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慣
カン   なれる to get used to   ならす to tame   
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身
シン   み body, person   
抜
バツ   ぬく to extract, pull out   ぬける to come / fall out; be omitted   ぬかす to omit   ぬかる to make a blunder   
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出
シュツ   スイ   だす to take out, to put out   でる to go out, to exit   
難
ナン   むずかしい difficult   かたい hard   
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