takibi wa atatakai.

The campfire is warm.

Breakdown of takibi wa atatakai.

• は: topic particle
• 暖あたたかい: warm
• 焚たき火び: a campfire

Questions & Answers about takibi wa atatakai.

How do you read 焚き火　は　暖かい。?

It is read:

たきび　は　あたたかい。

Romanization: takibi wa atatakai

A small pronunciation note:

• は is written ha, but when it is a particle, it is pronounced wa.

Why is は pronounced wa instead of ha?

This is one of the first things Japanese learners notice.

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

So in this sentence:

• 焚き火 = topic
• は = topic marker, pronounced wa
• 暖かい = warm

This is a standard spelling rule in Japanese grammar.

What does 焚き火 consist of? Is it one word?

Yes, 焚き火 is one word.

It is made from:

• 焚き from the verb 焚く（たく）, meaning to burn or to make a fire
• 火（ひ / び）, meaning fire

Together, 焚き火（たきび） means bonfire or campfire.

The ひ in 火 becomes び here because of a common sound change in compounds.

What is the function of は in this sentence?