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Grammar detail: 〜ことだ

〜ことだ  should ~; ~ is necessary
119 words
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Grammar Pattern
verb plain form
+
ことだ
means
should ~; ~ is necessary
ことだ is used when the speaker wishes to give advice to or counsel the listener, or as an expression of caution. The advice usually emphasizes the importance or necessity to do a particular thing.
Using this expression assumes sense of authority, so care should be taken when using it. It should not be used to give advice to or to caution a superior, a customer, etc.
例文: Example Sentences
なに
より
だいじ
大事
こと
じぶん
自分
あたま
かんが
える
こと
The most important thing is thinking for oneself.
たいせつ
大切
ことそのこと
せんせい
先生
そうだん
相談
する
こと
The important thing is you will talk with your teacher about it.
いま
わか
ひと
たち
いちばん
一番
ひつよう
必要
じぶん
自分
もの
かんが
える
しゅうかん
習慣
ける
こと
What is most necessary for young men today is to develop the habit of thinking for themselves.
わたし
たち
できることただ
しごと
仕事
える
までやり
つづ
ける
こと
All we can do is carry on the work until we finish it.
てがみ
手紙
さい
さいぜん
最善
ほうほう
方法
こころ
あること
なん
でも
める
こと
The best way to write letters is to put down whatever is in your mind.
The next example sentences demonstrate the expression used with the negative plain form of the verb.
わたしたち
私達
まも
べき
さいぜん
最善
さく
ひと
こと
くちだ
口出
ししない
こと
The best policy for us to observe is to mind our own business.
せいこう
成功
ひけつ
秘訣
しっぱい
失敗
かんが
えない
こと
The secret of success is not to think of failure.
らく
して
なに
よりうろたえないこと
Relax, and above all, don't panic.
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Kanji used in this grammar

レイ   example   たとえる to illustrate, to compare   たとえば for example   
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ブン   モン    literature   ふみ a letter   
カ   なに    なん what?   
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ダイ   タイ   おおきい big   おおいに very much   おお-    
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ジ   ズ   こと thing; matter   
ジ   シ   みずか self   
ブン   ブ   フン   わける to divide, to distinguish   わかる to understand   わかれる to be divided   わかつ to share, distribute   
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トウ   ト   ズ   あたま    かしら head   
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コウ   かんがえる to think about, consider   
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セツ   サイ   き to cut   きれる to break, to snap   
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セン   さき ahead   
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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 to give birth to   き pure, undiluted   お to grow, to sprout   はえる to grow, to sprout   はやす to grow, cultivate   
ソウ   ショウ    minister   あい- mutual   
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ダン    discussion   
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コン   キン   いま now   
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ジャク   ニャク   わか young   もしくは or   
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ジン   ニン   ひと person   
イチ   イツ   ひと    ひと- one   
バン    turn   
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ヒツ   かなら certainly, invariably   
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ヨウ   い to need   かなめ pivotal point   
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シュウ   なら to learn   
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カン   なれる to get used to   ならす to tame   
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フ   つける to put in place, affix   つ to adhere to   
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シ   わたくし    わたし I, myself   
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シ   ジ   つかえる to attend to   
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シュウ   end   おわる to come to an end   おえる to bring to an end   
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ゾク   つづ to continue   つづける to carry on with   
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シュ   hand   て    た-    
シ   かみ paper   
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ショ   か to write   
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サイ    occasion   きわ    -ぎわ edge   
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サイ   もっと most   
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ゼン   virtuous   よ virtous, good   
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ホウ   かた way, direction   
ホウ   ハッ   ホッ    method   
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シン   こころ heart   
ル   リュウ   とめる to detain   とまる to stop   
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タツ    arrive   
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シュ   ス   まも to protect, guard   もり babysitting   
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サク    policy   
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コウ   ク   くち mouth   
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シュツ   スイ   だ to take out, to put out   で to go out, to exit   
セイ   ジョウ   な to become   な to perform, to accomplish   
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ク   コウ    achievement   
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ヒ   secret   ひめる to keep secret   
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ケツ    separate   
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シツ   うしな to lose   
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ハイ   defeated   やぶれる to be defeated, frustrated   
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キ   ケ    spirit   
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ガク   ラク    music   たのしい happy, pleasant   たのしむ to be happy   
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