syouka ha taisetu desu.

It is read:

しょうか は たいせつ です

A few pronunciation notes:

• 消火 = しょうか
• は is written ha but here it is pronounced wa because it is the topic particle
• 大切 = たいせつ
• です is often pronounced closer to desu or even lightly des

So the whole sentence sounds like:

shooka wa taisetsu desu

消火 is a noun, and more specifically it is also a verbal noun.

That means:

• it can act like a noun, as it does in this sentence
• it can also combine with する to make a verb: 消火する = to put out a fire / to extinguish a fire

In 消火 は 大切 です, it is being treated as the topic of the sentence: as for fire extinguishing...

は marks the topic of the sentence.

So 消火は大切です has the structure:

• 消火は = as for fire extinguishing
• 大切です = is important

Japanese often organizes sentences by introducing a topic first, then saying something about it.

So the sentence is not literally built the same way as English. It is closer to:

• As for fire extinguishing, it is important

Even though the natural English translation may simply be Fire extinguishing is important or Putting out fires is important.

This is one of the first things learners notice.

When は is used as a particle, it is pronounced wa.
When は is part of a normal word, it is usually pronounced ha.

So in this sentence:

• written: 消火は大切です
• pronounced: しょうか わ たいせつ です

This is just a standard rule of modern Japanese grammar.

大切 means important / precious / valuable, and in this sentence it works as a na-adjective.

Here it is used as the predicate of the sentence:

• 消火は大切です = Fire extinguishing is important

A useful thing to know:

• before a noun, it usually takes な: 大切なこと = an important thing
• at the end of a sentence, it can appear as 大切です or 大切だ

So:

• 大切な仕事 = important work
• この仕事は大切です = This work is important

Because な is only used when a na-adjective directly modifies a noun.

Compare:

• 大切なこと = an important thing
  
  • here 大切 modifies こと, so you need な
• 消火は大切です = Fire extinguishing is important
  
  • here 大切 is not modifying a noun; it is the main predicate, so there is no な

This is a very common pattern with na-adjectives.

です makes the sentence polite.

So:

• 消火は大切です = polite
• 消火は大切だ = plain / less polite

In this sentence, です does not add a lot of meaning by itself; its main role is politeness and sentence-ending style.

This is one reason Japanese sentences can seem different from English ones: a sentence can end with an adjective-like word plus です, without needing a separate word exactly like English is in the same way.

Yes, you might hear 消火が大切です, but the nuance is a little different.

Very roughly:

• 消火は大切です = As for fire extinguishing, it is important
• 消火が大切です = Fire extinguishing is what is important or It is fire extinguishing that is important

So:

• は presents 消火 as the topic
• が can sound more like it is identifying or emphasizing the subject

For a simple general statement, 消火は大切です is very natural.

Yes. The spaces are just there to help learners read the parts more easily.

Normally, Japanese would be written as:

消火は大切です。

Without spaces.

Textbooks and beginner materials often insert spaces to show:

• 消火
• は
• 大切
• です

But in real Japanese writing, spaces are usually not used between words.

消火 specifically means extinguishing a fire or putting out a fire.

It does not primarily mean fire prevention.

That distinction is important:

• 消火 = putting a fire out
• 防火 = fire prevention / protection against fire

So 消火は大切です is about the importance of extinguishing fires, not preventing them in the first place.

It is polite and neutral, and it sounds somewhat general or instructional.

Because it uses:

• a Sino-Japanese noun: 消火
• a polite ending: です

it can feel like something you might see in:

• safety instructions
• training materials
• public information
• formal explanations

In casual conversation, someone might also express the idea in a less formal or more everyday way, depending on context. But grammatically, this sentence is perfectly normal and clear.