知る, 識る, しる
Conjugated: 知っている
Godan verb, Transitive
1. to be aware of, to know, to be conscious of, to cognize, to cognise
2. to notice, to feel
3. to understand, to comprehend, to grasp
4. to remember, to be acquainted with (a procedure)
5. to experience, to go through, to learn
あなたは1990年から彼女を知っているのですか?
に
Particle
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), with
5. by, from
間違いない, 間違い無い, まちがいない
Expression, See 紛れもない・まぎれもない
1. certain, sure, doubtless
2. I have no doubt, You can depend on it, It's a safe bet
この列車に間違いないですか。