〜のことだから no koto da kara

〜のことだから（no koto da kara）means “since it's (a person we know well), ...; knowing ..., ...”. Attaches to a noun referring to a well-known person (or group) to draw a confident conclusion or prediction based on that person's known character or habits. Formation: N（人）の ＋ ことだから

since it's (a person we know well), ...; knowing ..., ...

N2

Formation

N（人）の ＋ ことだから

Explanation

Attaches to a noun referring to a well-known person (or group) to draw a confident conclusion or prediction based on that person's known character or habits.

Examples

まじめな彼のことだから、きっと約束を守るだろう。
まじめなかれのことだから、きっとやくそくをまもるだろう。
Since he's such a serious person, he'll surely keep his promise.
心配性の母のことだから、もう何度も電話してきているはずだ。
しんぱいしょうのははのことだから、もうなんどもでんわしてきているはずだ。
Knowing my worrywart mother, she's surely already called many times.

Note

The noun is almost always a person (or a familiar group) whose character is shared knowledge; the sentence usually ends with きっと/だろう/に違いない.

FAQ

〜のことだから — what does it mean and how is it used?

since it's (a person we know well), ...; knowing ..., .... Attaches to a noun referring to a well-known person (or group) to draw a confident conclusion or prediction based on that person's known character or habits.

〜のことだから — how do you form it?

N（人）の ＋ ことだから

〜のことだから — any usage notes?

The noun is almost always a person (or a familiar group) whose character is shared knowledge; the sentence usually ends with きっと/だろう/に違いない.

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