► 副詞
確か [(1)たしか] [coll] meaning: maybe rank: 1
☆ それは確か半年くらい前の事だったと思う ⇨ I think it was about 6 months ago
☆ 彼は確か福岡出身だったと思う ⇨ I think he was from Fukuoka
► 動詞
確かめる [(4)たしかめる] meaning: confirm rank: 1
☆ 彼女は外出する前に鍵が閉まっているか確かめた ⇨ She made sure everything was locked before leaving her house
確かめる [(4)たしかめる] meaning: verify rank: 1
☆ その情報が本当か確かめる必要がある ⇨ We need to verify if the information is accurate
► 形容動詞
確か [(1)たしか] meaning: certain rank: 1
☆ あれは確かに彼だった ⇨ I’m sure it was him
☆ それは確か？ ⇨ Is that really definitive? Are you sure about that?
☆ 彼は確かに変わった人だ ⇨ He’s certainly a weird person
☆ 玄関の鍵は確かに掛けた ⇨ I’m very sure I locked the front door
☆ 確かな事は未だ分からない ⇨ We are yet to know anything for sure
確か [(1)たしか] meaning: trust rank: 1
☆ その情報は確かとは思えない ⇨ I don’t think that information is trustworthy
☆ 彼の腕は確かだ ⇨ His skills are solid
☆ 確かな品質の製品 ⇨ A product with trustworthy quality