〜ことだし: meaning and usage

How to form it

• verb (plain form)/い-adjective+ことだし
• な-adjective (stem)+な+ことだし

How it is used

Conversational: gives one reason (implying there may be others) for a decision, suggestion or invitation that follows, often with 「〜よう」 or 「〜ましょう」: 'since…, let's…'.

Examples

1. 夜も更けたことだし、 もう寝ましょう。

   Since it's late at night (among other reasons), let's go to sleep already.

2. 天気もいいことだし、散歩にでも行こうか。

   The weather's nice, so shall we go for a walk or something?

3. みんなそろったことだし、そろそろ始めましょう。

   Now that everyone's here, let's get started.