Grammar Info
N1 Lesson 4: 17/17

ことだし
(and) so, because, since

Structure
Verb + ことだし
［い］Adjective + ことだし
［な］Adjective + な(1) + ことだし
Noun + の(1) + ことだし

(1) である
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使用域 一般
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Information
  • (A) ことだし (B) is an expression used to state reason/cause, implying that there are other reasons as well. It originates in particle し, but it shows the intention to state the reason more clearly as it is not used to simply connect clauses. It is also considered more objective and therefore polite. ことだし often indicates good circumstances (A) to do (B), therefore is followed with expressions of determination, suggestion or invitation like ないか、volitional form、たらどう. When (A) is a noun denoting a person it indicates judgment that based on the person's character/behavior something is the case.
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飛行機代（ひこうきだい）も安（やす）いことだし天気（てんき）もいいから沖縄（おきなわ）に行（い）こうよ。
Since plane tickets are cheap and the weather is nice, let's go to Okinawa.
Unlike し, ことだし is usually not repeated, but can still be used to state more than one reason/cause directly with expressions like から/ので and the like
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    • 割引（わりびき）クーポンもあることだし、明日（あした）映画（えいが）を一緒（いっしょ）に観（み）に行かない？
    I also have discount coupons, so why don't we go watch a movie together tomorrow?
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    • もう夜（よる）も更（ふ）けてくることだし、今日（きょう）のパーティーはこれでお開（ひら）きにしよう！
    It's getting late, so let's call it a night with this!
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