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〜ことだし

since (among other things), so

Plain form + ことだし (な-adj + な · Noun + の / である)

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ことだし gives a reason for a suggestion or decision, softly implying there are other reasons too: 雨も止んだことだし、散歩に行こうか, "the rain's stopped, so shall we go for a walk?"

It's conversational and gentle. The second half is almost always a suggestion (ましょう, よう, ませんか) or the speaker's own decision (ます, ことにする).

It's related to し (N4), which lists reasons. ことだし picks one reason out and leaves the rest unsaid, which makes the suggestion sound natural and unforced.

The first half often contains も: 天気もいいことだし, 夜も遅いことだし. That も hints "and there are other reasons as well".

Examples

  • 雨あめも止やんだことだし、散歩さんぽに行いこうか。

    The rain's stopped, so shall we go for a walk?

  • みんな揃そろったことだし、始はじめましょう。

    Now that everyone's here, let's begin.

  • 天気てんきもいいことだし、外そとで食たべよう。

    The weather's nice, so let's eat outside.

  • 夜よるも遅おそいことだし、そろそろ帰かえります。

    It's getting late, so I'll be heading home.

  • 仕事しごとも終おわったことだし、飲のみに行いきませんか。

    Now that work's done, how about going for a drink?

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