connective N2 common casualpolitewritten
のことだから — since it's ~
のことだから
Builds on のこと
Meaning
- since it's ~ / knowing ~ (and their character) — predicts what someone will do from their well-known nature
Key sentence
彼のことだから、また遅刻するだろう。
Knowing him, he'll probably be late again.
Easily confused with
See のことだから in real sentences
Jengo shows のことだから the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled with reference to A Dictionary of Intermediate Japanese Grammar.