kanozyo no iki ha atatakakatta.

It is read:

かのじょ の いき は あたたかかった。

Word by word:

• 彼女 = かのじょ
• の = no
• 息 = いき
• は = written ha, but pronounced wa here
• 暖かかった = あたたかかった

彼女の means her or more literally of her.

The particle の connects two nouns and shows possession or relationship.

So:

• 彼女 = she / her / girlfriend, depending on context
• 彼女の息 = her breath

In this sentence, の works like the English 's or of.

息（いき） means breath.

It can refer to:

• the air someone breathes out
• breathing in general, depending on context

In this sentence, it most naturally means her breath as something physically felt, such as warm breath on someone’s skin.

A related word you may also see is:

• 吐息（といき） = breath, often exhalation, sometimes with a softer or more literary feeling

This is a very common beginner question.

The character は is normally read ha, but when it is used as the topic particle, it is pronounced wa.

So in this sentence:

• written: は
• pronounced: わ

This is just a standard rule of modern Japanese grammar.

は marks the topic of the sentence, while が often marks the subject more directly.

So 息は暖かかった presents her breath as the thing being talked about:

• As for her breath, it was warm.

If you used が, it could sound more like identifying or emphasizing the subject:

• Her breath was the warm thing / It was her breath that was warm

In many situations, both can be possible, but は sounds very natural for a neutral description.

暖かかった is the past tense of the い-adjective 暖かい.

Breakdown:

• 暖かい = warm
• remove い
• add かった
• result: 暖かかった = was warm

This is the normal past form for い-adjectives.

Examples:

• 寒い → 寒かった = was cold
• 新しい → 新しかった = was new
• 暖かい → 暖かかった = was warm

Both 暖かい and 温かい are read あたたかい, and both can mean warm, but there is a nuance difference.

A common guideline is:

• 暖かい: warm air, weather, atmosphere
• 温かい: warmth of things, food, drinks, hands, body, etc.

Since breath is warm air, 暖かい makes very good sense here.

That said, in real life there can be overlap, and sometimes both appear depending on style or writer preference. But 暖かい is very natural for breath.

No. 彼女（かのじょ） can mean:

• she
• her
• girlfriend

The meaning depends on context.

In 彼女の息, it means her.

Also, in real Japanese, speakers often avoid pronouns when context is clear. They might use the person’s name instead, or omit it entirely.

So while 彼女 is correct, Japanese does not use she/her as automatically or as often as English does.

Yes, it is natural, especially in narrative or descriptive writing.

It sounds like a simple observation:

• Her breath was warm.

It could appear in:

• a novel
• a romantic scene
• a scene where someone is physically close to another person
• a description of someone breathing on a cold day

In casual daily conversation, Japanese often gives a bit more context, but the sentence itself is perfectly natural.

Japanese normally does not use spaces between words.

So the standard written form is:

彼女の息は暖かかった。

Spaces are often added in teaching materials to help beginners see the parts more clearly.

Yes, potentially.

Because は marks the topic, it can sometimes create a slight contrast, depending on context.

For example, if the surrounding context compares different things, 息は could imply something like:

• Her breath was warm, though something else was not
• At least her breath was warm

However, without special context, you should understand it simply as a neutral statement:

• Her breath was warm.

Yes. In Japanese, い-adjectives can function as the main predicate of a sentence without using a separate word for to be.

So:

• 息は暖かい。 = Her breath is warm.
• 息は暖かかった。 = Her breath was warm.

There is no need to add something like was as a separate word. The adjective itself changes form to show tense.