Grammar Info

N1 Lesson 4: 17/17

ことだし

(And) so, Because, Since

Structure

Verb + こと
[い]Adjective + こと
[な]Adjective + (1) + こと
Noun + (1) + こと

(1) である

Details

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    Standard

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    一般

Rare Kanji

About ことだし

ことだし is a combination of the noun こと 'thing', the auxiliary verb だ, and the conjunction particle し, used for listing reasons. The whole structure itself often translates simply as 'because (A)', or 'since (A)', but places extra emphasis on there being other reasons besides what the speaker has specified.
This structure may appear after any word in its attributive form, or after a noun that has been followed with の.
  • せっかく(きみ)のお(とう)さんとお(かあ)さんが()ことだし、どっかいい焼肉屋(やきにくや)さんにでも()こう。
    Since your father and mother are coming all the way (to see us), let's go to a nice yakiniku restaurant.
  • 天気(てんき)もいいことだし、みんなで公園(こうえん)にでも()きましょう。
    Since the weather is nice, let's all go to the park together.
  • (かれ)(つと)めている会社(かいしゃ)有名(ゆうめい)ことだし給料(きゅうりょう)もいいんだろう。
    Since the company he works for is famous, his salary must be good.
  • (かれ)ことだし、また(おく)れてくるんじゃないの。
    Knowing him, I bet that he will come late as usual.
Just like with its standard use in creating lists, し is being used in this grammar point to show that (A) is not exclusive. The way this comes across is that 'while there are other reasons, (A) is good enough to (B)'. (B) is usually some suggestion, invitation, or expression of determination.

Examples

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  • 飛行機代(ひこうきだい)(やす)ことだし天気(てんき)いいから沖縄(おきなわ)()こう

    Since plane tickets are cheap and the weather is nice, let's go to Okinawa.

    Unlike , ことだし is usually not repeated, but can still be used to state more than one reason or cause directly with expressions like から/ので and the like.

    • 割引(わりびき)クーポンあることだし明日(あした)映画(えいが)一緒(いっしょ)()に行かない

      I also have discount coupons, so why don't we go watch a movie together tomorrow?

      • もう(よる)()てくることだし今日(きょう)パーティーこれ(ひら)きにしよう

        It's getting late, so let's call it a night with this!

        • 十分(じゅうぶん)反省(はんせい)ていることだし今回(こんかい)もうこの(へん)(ゆる)てあげたら

          I'm sure he's also sufficiently remorseful, so why won't you already let him off the hook this time?

          • 彼女(かのじょ)ことだし、きっと(つぎ)試合(しあい)には()わたし(しん)ている

            Knowing her, I am convinced that she will surely win the next match.

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