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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
何
より
だいじ
大事
な
ことは、
じぶん
自分
の
あたま
頭
で
かんが
考
える
ことだ。
The most important thing is thinking for oneself.
たいせつ
大切
な
ことは、そのことで
せんせい
先生
と
そうだん
相談
する
ことだ。
The important thing is you will talk with your teacher about it.
いま
今
の
わか
若
い
ひと
人
たち
に
いちばん
一番
ひつよう
必要
な
のは、
じぶん
自分
でものを
かんが
考
える
しゅうかん
習慣
を
つ
付
ける
ことだ。
What is most necessary for young men today is to develop the habit of thinking for themselves.
わたし
私
たち
にできることはただ
しごと
仕事
を
お
終
える
までやり
つづ
続
ける
ことだ。
All we can do is carry on the work until we finish it.
てがみ
手紙
を
か
書
く
さい
際
の
さいぜん
最善
の
ほうほう
方法
は、
こころ
心
にあることを
なん
何
でも
か
書
き
と
留
める
ことだ。
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
が
まも
守
る
べき
さいぜん
最善
の
さく
策
は、
ひと
人
のことには
くちだ
口出
ししない
ことだ。
The best policy for us to observe is to mind our own business.
せいこう
成功
の
ひけつ
秘訣
は
しっぱい
失敗
を
かんが
考
えない
ことだ。
The secret of success is not to think of failure.
き
気
を
らく
楽
にして、
なに
何
よりもうろたえないことだ。
Relax, and above all, don't panic.
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Kanji used in this grammar

例
レイ   example   たとえる to illustrate, to compare   たとえば for example   
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文
ブン   モン    literature   ふみ a letter   
何
カ   なに    なん what?   
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大
ダイ   タイ   おおきい big   おおいに very much   おお-    
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事
ジ   ズ   こと thing; matter   
自
ジ   シ   みずから self   
分
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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頭
トウ   ト   ズ   あたま    かしら head   
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考
コウ   かんがえる to think about, consider   
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切
セツ   サイ   きる to cut   きれる to break, to snap   
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先
セン   さき ahead   
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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   
相
ソウ   ショウ    minister   あい- mutual   
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談
ダン    discussion   
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今
コン   キン   いま now   
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若
ジャク   ニャク   わかい young   もしくは or   
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人
ジン   ニン   ひと person   
一
イチ   イツ   ひとつ    ひと- one   
番
バン    turn   
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必
ヒツ   かならず certainly, invariably   
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要
ヨウ   いる to need   かなめ pivotal point   
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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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付
フ   つける to put in place, affix   つく to adhere to   
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私
シ   わたくし    わたし I, myself   
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仕
シ   ジ   つかえる to attend to   
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終
シュウ   end   おわる to come to an end   おえる to bring to an end   
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続
ゾク   つづく to continue   つづける to carry on with   
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手
シュ   hand   て    た-    
紙
シ   かみ paper   
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書
ショ   かく to write   
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際
サイ    occasion   きわ    -ぎわ edge   
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最
サイ   もっとも most   
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善
ゼン   virtuous   よい virtous, good   
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方
ホウ   かた way, direction   
法
ホウ   ハッ   ホッ    method   
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心
シン   こころ heart   
留
ル   リュウ   とめる to detain   とまる to stop   
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達
タツ    arrive   
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守
シュ   ス   まもる to protect, guard   もり babysitting   
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策
サク    policy   
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口
コウ   ク   くち mouth   
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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   
成
セイ   ジョウ   なる to become   なす to perform, to accomplish   
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功
ク   コウ    achievement   
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秘
ヒ   secret   ひめる to keep secret   
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訣
ケツ    separate   
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失
シツ   うしなう to lose   
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敗
ハイ   defeated   やぶれる to be defeated, frustrated   
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気
キ   ケ    spirit   
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楽
ガク   ラク    music   たのしい happy, pleasant   たのしむ to be happy   
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