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Learn Hardcore Japanese: kositu ha hiroi desu. - The private room is spacious.

Hardcore Japanese
/Singing karaoke with friends
/koshitsu wa hiroi desu.

koshitsu wa hiroi desu.

Word

個室こしつ　は　広ひろい　です。koshitsu wa hiroi desu.

Meaning

The private room is spacious.

Part of speech

sentence

Pronunciation

Course

Hardcore Japanese

Lesson

Singing karaoke with friends

Breakdown of koshitsu wa hiroi desu.

広ひろいhiroi

個室こしつkoshitsu

Questions & Answers about koshitsu wa hiroi desu.

How do you read 個室は広いです。?

It is read:

こしつはひろいです。

In rōmaji:

koshitsu wa hiroi desu

A very important point: the particle は is written ha, but when it is used as a topic marker, it is pronounced wa.

Also, in normal Japanese writing, you would usually see it without spaces:

個室は広いです。

What does は do in this sentence?

は marks the topic of the sentence.

So 個室は means something like:

as for the private room
speaking of the private room

Then 広いです says something about that topic.

So the sentence structure is roughly:

個室は = as for the private room
広いです = is spacious

This is one reason Japanese can feel different from English: the sentence is organized around a topic, not necessarily a grammatical subject in the same way English is.

Why is there no separate word for is before 広い?

Because 広い is an i-adjective, and in Japanese, an i-adjective can act as the predicate by itself.

So:

広い。 = It is spacious.
広いです。 = It is spacious. / It’s spacious. (polite)

English needs is, but Japanese does not need a separate verb here in the same way.

Nihon-shiki romanizationwatasi ha tyuugoku kara kimasita

Hepburn romanizationwatashi wa chuugoku kara kimashita

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What kind of word is 広い?

広い is an i-adjective.

That means:

it ends in い
it can directly describe a noun:
- 広い個室 = a spacious private room
it can also end a sentence:
- 個室は広い。 = The private room is spacious.

This is different from a na-adjective, which uses な before a noun and behaves differently.

For example:

静かな部屋 = a quiet room
部屋は静かです = The room is quiet

But with 広い, you do not say 広いな個室.

Why is it 広いです and not 広いだ?

Because 広い is an i-adjective, and だ is not used after i-adjectives.

Correct:

広い。 plain
広いです。 polite

Incorrect:

広いだ。

A useful rule:

Nouns / na-adjectives can use だ / です
i-adjectives use their own form, and です is added only for politeness

So:

静かだ / 静かです are fine
広いだ is not

What exactly does です do here?

Here, です mainly makes the sentence polite.

Compare:

個室は広い。 = plain
個室は広いです。 = polite

With an i-adjective, です does not change the basic meaning very much. It just makes the sentence more appropriate in normal polite conversation.

So you can think of です here as a politeness marker attached to the statement.

Is this sentence natural Japanese?

Yes, 個室は広いです。 is grammatical and natural.

It sounds like a simple statement such as:

in a hotel description
in a restaurant or internet café context
in a comparison between room types

That said, without context it can feel a little textbook-like, because real conversation often includes more detail, such as:

この個室は広いです。 = This private room is spacious.
個室のほうが広いです。 = The private room is more spacious.

But the sentence itself is perfectly fine.

Why are there spaces between the words here?

The spaces are usually just for learners.

Normal Japanese writing does not usually put spaces between words, so you would normally write:

個室は広いです。

Beginner materials often add spaces to make the structure easier to see.

What nuance does 個室 have?

個室 usually means a private room or individual room.

Depending on context, it could mean:

a private room in a restaurant
a private room in a hospital
a private booth/room in a business or service setting
a single private room in lodging or housing contexts

So the exact English translation can vary a little by situation, even though the core idea is a room for one person or one group, separated from others.

Could this sentence use が instead of は?

Sometimes, yes, but the nuance changes.

個室は広いです。 = As for the private room, it’s spacious.
個室が広いです。 = The private room is the one that is spacious / puts more focus on 個室

Very roughly:

は = topic / general statement / contrast
が = focus / identification / new information

In many beginner examples, は is used because it is the most straightforward way to say something about a topic.

How would I make this negative, past, or a question?

Because 広い is an i-adjective, it changes like this:

個室は広いです。 = The private room is spacious.
個室は広くないです。 = The private room is not spacious.
個室は広かったです。 = The private room was spacious.
個室は広くなかったです。 = The private room was not spacious.

To make it a question, add か:

個室は広いですか。 = Is the private room spacious?

This is a very useful pattern for i-adjectives in general.

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