〜ことだから
N2koto dakara
knowing (someone); since it's (someone), surely
Formation
Noun + の + ことだから
Chinese meanings
以……的性格;既然是……
Chinese formation
名词+の+ことだから
Chinese usage
根据对某人性格的了解推测其行为。
Chinese notes
后项常用きっと、だろう等。
Examples
- 几帳面な彼のことだから、書類はもう準備してあるだろう。Knowing how meticulous he is, he's probably got the documents ready already.他那么认真,文件大概已经准备好了。
- あの子のことだから、きっとどこかで寄り道をしているんだよ。Knowing that kid, I bet they've stopped off somewhere on the way.以那孩子的性格,一定是在什么地方绕路玩去了。
Notes
From what the speaker knows of a person's character, it leads to a guess about their behavior. Usually followed by だろう, きっと or に違いない.
#reason#conjecture
Related N2 grammar
Use this entry in code
import { getGrammarById } from 'kotowa';
getGrammarById('koto-dakara');
{
"id": "koto-dakara",
"pattern": "〜ことだから",
"romaji": "koto dakara",
"level": "N2",
"meaning": "knowing (someone); since it's (someone), surely",
"formation": "Noun + の + ことだから",
"examples": [
{
"ja": "几帳面な彼のことだから、書類はもう準備してあるだろう。",
"furigana": "{几帳面|きちょうめん}な{彼|かれ}のことだから、{書類|しょるい}はもう{準備|じゅんび}してあるだろう。",
"en": "Knowing how meticulous he is, he's probably got the documents ready already."
},
{
"ja": "あの子のことだから、きっとどこかで寄り道をしているんだよ。",
"furigana": "あの{子|こ}のことだから、きっとどこかで{寄|よ}り{道|みち}をしているんだよ。",
"en": "Knowing that kid, I bet they've stopped off somewhere on the way."
}
],
"tags": [
"reason",
"conjecture"
],
"notes": "From what the speaker knows of a person's character, it leads to a guess about their behavior. Usually followed by だろう, きっと or に違いない.",
"zh": {
"status": "reviewed",
"source_hash": "7ddbae2232ab9b265ff5042e16926a3563176a57328df5a175aa76a7a4efdb35",
"meanings": [
"以……的性格",
"既然是……"
],
"formation": "名词+の+ことだから",
"explanation": "根据对某人性格的了解推测其行为。",
"notes": "后项常用きっと、だろう等。",
"examples": [
{
"ja": "几帳面な彼のことだから、書類はもう準備してあるだろう。",
"zh": "他那么认真,文件大概已经准备好了。"
},
{
"ja": "あの子のことだから、きっとどこかで寄り道をしているんだよ。",
"zh": "以那孩子的性格,一定是在什么地方绕路玩去了。"
}
],
"references": [
"sources/grammar/n2.json#koto-dakara",
"Original Chinese authored and reviewed by Codex; no independent human review"
],
"reviewer": "Codex",
"review_method": "ai",
"reviewed_at": "2026-10-28",
"review_hash": "1e09e90203fafb5c9c79d58fad094d70dc4ecb6138620a924aa1a4b706ec7023"
}
}