〜のことだから

Meaning

This pattern attaches to nouns referring to people and expresses a judgment or prediction based on that person's character, personality, or typical behavior. It indicates the speaker's reasoning for their conclusion, often used with expressions of certainty like きっと, に違いない, or だろう.

Formation

Examples

1. 彼のことだから、きっと途中で諦めないと思います。
   Given that he is who he is, I'm sure he won't give up halfway through.

2. 時間に正確な山田さんのことだから、約束の時間通りに来るに違いない。
   Since Yamada is punctual about time, he will definitely come at the promised time.

3. A:去年会社をやめた高橋さんは今どうしているのかな。 B:あの有能な高橋さんのことだから、きっとどこかで活躍しているだろう。
   A: I wonder what Takahashi, who quit the company last year, is doing now. B: Being the capable person he is, Takahashi is surely thriving somewhere.

Summary

• Used to make predictions or judgments based on someone's known character or traits
• Always follows nouns referring to people, typically with の before ことだから
• Commonly paired with certainty expressions like きっと, に違いない, or だろう for emphasis