JLPT N2 grammar
〜ことだから — Meaning & Examples
Noun(person) + の + ことだから = knowing them, surely Y — a confident guess based on someone's known character. 真面目な田中さんのことだから、時間通りに来るだろう.
〜ものだから and 〜ことだから
〜ものだから／もので = "it's just that X, so (that's why)..." An explanation or excuse, often slightly defensive — the speaker is accounting for something that might otherwise look bad.
Formation: plain form + ものだから (な-adj + な, noun + な); もので is the softer, more polite short form
電車が遅れたものだから、会議に間に合わなかった。
= It's just that the train was delayed, so I didn't make it to the meeting on time.
子供が熱を出したもので、早退させていただきました。
= My child came down with a fever, so I left early (I hope you understand).
あまりに驚いたものだから、声も出なかった。
= I was so startled that I couldn't even speak.
The feel: "please understand — it wasn't my fault / I couldn't help it." Much more personal and excuse-flavoured than から. Common when apologising or explaining yourself to someone above you.
---
〜ことだから = "knowing X, (I'm sure) Y." A confident prediction about how a specific, known person (or group) will behave — based on their established character.
Formation: noun + の + ことだから (almost always a person / people)
真面目な田中さんのことだから、時間通りに来るだろう。
= Knowing Tanaka, conscientious as he is, 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 kid, he's bound to have forgotten something again.
The logic: "That's so typical of them that I can predict this." It needs a shared understanding of the person's character — you can't use it about a stranger.
One-sentence contrast of all four:
プロだけあって上手だ (lives up to it) / プロだけにミスは許されない (all the more so) / 緊張していたものだからミスをした (excuse) / 完璧主義の彼のことだから、何度も確認するだろう (confident guess).
Practice questions
Try these 2 questions on 〜ことだから. Pick an answer in your head, then open “Show answer”.
1. 真面目な田中さんのことだから、時間通りに来るだろう means?
- I don't know if Tanaka will come on time
- Knowing Tanaka, conscientious as he is, he'll surely come on time
- Tanaka is usually late
- Tanaka told me he'll come on time
Show answer
Answer: Knowing Tanaka, conscientious as he is, he'll surely come on time
〜ことだから = a confident prediction about how a specific, known person will behave, based on their established character.
2. 〜ことだから requires what before it?
- A noun (usually a specific person/group) + の, whose character is known to both speakers
- A verb in the past tense
- An い-adjective
- A number
Show answer
Answer: A noun (usually a specific person/group) + の, whose character is known to both speakers
It needs a shared understanding of the person's character — あの子のことだから works; a stranger does not.
Practise 〜ことだから in the free app
This point is part of the “🎯 Fitting Expectations — だけあって・だけに・ものだから・ことだから” lesson in A Star Japanese. Study it with examples, a quiz, flashcards and timed JLPT N2 mock exams. Free on iPhone and Android.
Free on iPhone and Android · No ads
Related N2 grammar points
From the same lesson: 🎯 Fitting Expectations — だけあって・だけに・ものだから・ことだから
- 〜だけあってAs you'd expect from X — the result lives up to X, usually admiring.
- 〜だけにAll the more because X — X intensifies the result, which can be positive OR negative (oft…
- だけあって vs だけに有名なだけあって混んでいる (lives up to it, neutral) vs 有名なだけに批判も多い (precisely because — X cuts both w…
- 〜ものだから／ものでIt's just that X, so...
Frequently asked questions
What does 〜ことだから mean?
Noun(person) + の + ことだから = knowing them, surely Y — a confident guess based on someone's known character. 真面目な田中さんのことだから、時間通りに来るだろう.
Is 〜ことだから on the JLPT N2 test?
〜ことだから is taught in the JLPT N2 grammar course in A Star Japanese (lesson “🎯 Fitting Expectations — だけあって・だけに・ものだから・ことだから”), so it is a pattern learners at this level are expected to recognise. The JLPT does not publish an official grammar list, so treat this as a study guide rather than an official requirement.
How can I practise 〜ことだから?
Open the “🎯 Fitting Expectations — だけあって・だけに・ものだから・ことだから” lesson in the free A Star Japanese app for iPhone and Android. It has examples, a quiz after every lesson, flashcards with spaced repetition and timed JLPT N2 mock exams, with no ads.