Grammar Info
N3 Lesson 5: 11/21

と言(い)うのは事実(じじつ)だ
It is a fact that ~, There is no doubt that

Structure
Casual
Formal
Phrase + (という) + 事実 +
Phrase + (という) + 事実 + です
Details
Register Standard
使用域 一般
Information
~というのは事実(じじつ)だ is a phrase used to strongly express that (A) is something that is ‘true’, ‘a fact’, or has ‘no doubt’. というのは may be used after almost any phrase, before the 名詞(めいし) 事実(じじつ) ‘truth’, paired with the 助動詞(じょどうし) (auxiliary verb) (or です) will determine that phrase to be a fact.
  • この人(ひと)私(わたし)母親(ははおや)殺(ころ)したというのは事実(じじつ)だ
    It is a fact that this person killed my mother.
  • 彼女(かのじょ)弁護士(べんごし)というのは事実(じじつ)だ
    It is a fact that she is a lawyer.
The literal translation というのは事実(じじつ)だ is ‘that which is (A) is true’, as (A) is just a nominalized phrase. It is also quite common to see this expression with という omitted, the only difference being that it sounds slightly weaker.
  • 赤信号(あかしんごう)無視(むし)したのは事実(じじつ)
    It is true that I ignored the red light.
  • 彼女(かのじょ)仲直(なかなお)りしたのは事実(じじつ)
    It is a fact that I worked it out with my girlfriend.
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彼(かれ)が俳優(はいゆう)だというのは事実(じじつ)だ
It is a fact that he is an actor.
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彼女(かのじょ)二十歳(はたち)というのは事実(じじつ)だ
It is a fact that she is 20 years old.
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新(あたら)しい細菌(さいきん)が発見(はっけん)されたというのは事実(じじつ)だ
It is a fact that a new bacteria has been discovered.
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