この しごとは きけんなんです。
kono shigoto wa kiken na n desu.
This job is dangerous.

The nuance of んです (n desu) is all about providing an explanation or giving a reason. It’s like when a homie asks you, “Yo, why you lookin’ so serious?” and you gotta hit ’em with the whole story. You’re not just sayin’ a simple sentence; you’re lettin’ ’em know the whole deal, the backstory, the reason behind what’s goin’ down. It adds a kinda “it’s because…” vibe to your words, makin’ it sound natural and real. It’s how you answer a question or make a statement that explains somethin’ that’s already been noticed. It’s like the difference between just sayin’ “I’m tired” and sayin’ “I’m tired ’cause I been hustlin’ all night.” That second part, that’s the んです (n desu) energy.

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This is how you put it all together. It’s simple, but you gotta get it right.

Word Type	Rule	Examples
Verb	Casual form + んです	いくんです (iku n desu), いったんです (itta n desu)
い-Adjective	い-Adjective + んです	いそがしいんです (isogashii n desu)
な-Adjective	な-Adjective + なんです	しずかなんです (shizuka na n desu)
Noun	Noun + なんです	いしゃなんです (isha na n desu)

Casual Form

Alright, let’s talk about the casual form, the street version of this grammar. Instead of んです (n desu), you just drop the “desu” and hit ’em with んだ (n da). It’s for when you’re talkin’ to your crew, your real homies, and you don’t gotta be all proper and formal. It’s short, it’s quick, and it gets the point across.

Word Type	Rule	Examples
Verb	Casual form + んだ	いくんだ (iku n da), いったんだ (itta n da)
い-Adjective	い-Adjective + んだ	忙しいんだ (isogashii n da)
な-Adjective	な-Adjective + なんだ	しずかなんだ (shizuka na n da)
Noun	Noun + なんだ	いしゃなんだ (isha na n da)

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Think of it like this: your words are a rap track. The main part of your sentence is the beat, the rhythm. But sometimes, you need to drop a little somethin’ extra, a little ad-lib or a sound effect to make the track hit harder and make more sense. That んです (n desu) is like that little “skrrrt” or “brrrrrat” sound in the middle of a bar. It gives your words that extra flavor, that extra punch that lets everyone know what’s really poppin’. You ain’t just sayin’ the words; you’re givin’ ’em the whole story, the full-on explanation.

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Before we get to the examples, let’s learn some street knowledge.

めいれい (Meirei)

English: Order; command; instruction.

Yo, when the boss gives the word, you best listen up. It ain’t a suggestion, it’s a command. You follow the orders down to the letter, no questions asked. Like when Pacino tells his crew what the game plan is in “Heat” – that’s a meirei. You mess up, and you’re out. Simple as that.

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かせぎ (Kasegi)

English: Earnings; income.

This is all about the hustle, my dude. The loot, the paper, the cash you pull in from the streets. Whether you’re runnin’ a legit business or you’re on that underground grind, what you’re pullin’ in at the end of the day is your kasegi. It’s what keeps your lights on and your pockets fat.

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へんこうに なる (Henkou ni naru)

English: To be changed; to be altered.

Sometimes you gotta switch up the plan, you know? Things get hot, the heat’s on, and the whole operation’s gotta get changed. The meeting spot, the time, the whole damn strategy. It’s all about stayin’ one step ahead. So when a plan gets henkō ni naru, you gotta be quick on your feet and roll with the punches.

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まもる (Mamoru)

English: To protect; to defend.

This is the code of the streets, man. You protect your family, you protect your crew, you protect your turf. You stand up for what’s yours and you don’t let nobody disrespect it. It’s that fierce loyalty you see in every gangster flick, like when the Corleones protect their family name in “The Godfather.” You mamoru what’s important, no matter the cost.

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こわがっている (Kowagatteiru)

English: To be scared; to be afraid.

Look, there’s a difference between bein’ cautious and bein’ a punk. When you’re kowagatteiru, you’re lettin’ fear control you. You’re jumpin’ at shadows, you’re backin’ down from a fight. In this life, you can’t show fear. The minute they see you’re afraid, they’re gonna eat you alive. You gotta act tough, even when you’re shakin’ in your boots.

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Let’s put this all together, homie. Here’s how you’d use んです (n desu) in the streets.

なわばりを まもるんです。
nawabari o mamoru n desu.
I gotta protect my territory.

さくばん、 やつを しめたんです。
sakuban, yatsu o shimeta n desu.
Last night, I beat him up.

あした、 とりひきが あるんです。
ashita, torihiki ga aru n desu.
There’s a deal happening tomorrow.

けいかくが へんこうに なったんです。
keikaku ga henkou ni natta n desu.
The plan has changed.

彼はまだ若いんです。
かれは まだ わかいんです。
kare wa mada wakai n desu.
He’s still young.

たーげっとは おれの おとうとなんです。
taagetto wa ore no otouto na n desu.
The target is my younger brother.

おれの かせぎは すくないんです。
ore no kasegi wa sukunai n desu.
My earnings are small.

それは ぼすからの めいれいなんです。
sore wa bosu kara no meirei na n desu.
That’s an order from the boss.

みんな こわがっているんです。
minna kowagatteiru n desu.
Everyone is scared.

あいつは かたぎじゃないんです。
aitsu wa katagi ja nai n desu.
He ain’t a civilian.

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Peace out, stay real. Don’t be a mark.