Noun (person) + のことだから

[Because it's (that person); knowing (someone) as we do]

Connection: Noun (person) + のことだから

Usage: Used to make a prediction or judgment based on well-known characteristics of a person. "Because it's him/her (and we know what they're like), they will surely..." Always refers to a specific person whose traits are understood by both speaker and listener.

Examples:

彼のことだから、きっと時間通りに来るだろう。(Knowing him, he'll surely come on time.)

あの子のことだから、また忘れ物をしているに違いない。(Knowing that child, they've surely forgotten something again.)

真面目な田中さんのことだから、もう準備は終わっているはずだ。(Knowing the diligent Tanaka-san, the preparations must already be finished.)