Meaning & usage
のことだから follows a noun (usually a person's name or pronoun) and expresses that the speaker knows the person's character or habits well, so they can predict or expect something about them. It carries the nuance of drawing a conclusion from what one knows about that person.
Example sentences 3
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あなたのことだから上々でしょう。
I hope and I know you did great!
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トムのことだから感謝祭にはボストンに来るんじゃないかな。
I think Tom may come to Boston for Thanksgiving.
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例年通りだった。特に落胆はなかった。共働きの家では当たり前のことだから。
It was an ordinary year, no especial disappointments. Just the run of the mill goings-on of a dual-income household.