JLPT N1
～ことだし
since; because (giving a reason for a decision)
Structure / Usage
Verb / Adj (plain form) + ことだし
Example Sentences
天気もいいことだし、ピクニックに行こう。
Since the weather is nice, let's go on a picnic.
せっかく来たことだし、もう少しゆっくりしていきなよ。
Since you came all this way, why don't you stay a little longer?