Noun (person) + のことだから

[Because it's (that person) / Knowing (that person)]

Connection: Noun (person) + のことだから

Usage: Used to make a prediction or judgment based on the well-known character or habits of a specific person. The speaker and listener both know the person being discussed.

Key point: Always refers to a specific, known person — never abstract nouns.

Examples:

真面目な田中さんのことだから、きっと時間通りに来るだろう。(Knowing the serious Tanaka-san, he'll surely come on time.)

あの人のことだから、また遅刻するに違いない。(Knowing that person, they'll surely be late again.)

彼女のことだから、もう準備は終わっているだろう。(Knowing her, she's probably already finished preparing.)