kainushi ga kyariikeesu o tsukau.

direct object particle

Breakdown of kainushi ga kyariikeesu o tsukau.

• が: subject particle
• 使つかう: to use
• 飼かい主ぬし: a pet owner

Questions & Answers about kainushi ga kyariikeesu o tsukau.

How do you read 飼い主?

It is read かいぬし.

• 飼い comes from 飼う（かう）, meaning to keep / to raise / to own (an animal).
• 主（ぬし） means owner or master.

So 飼い主 means the owner of a pet or the person who keeps the animal.

One important thing for learners: the reading ぬし for 主 is not the most obvious one if you only know readings like しゅ or おも, so this is a good word to memorize as a whole.

Why is が used after 飼い主?

が marks the grammatical subject of the sentence.

So in:

• 飼い主 が キャリーケース を 使う。

the 飼い主 is the one doing the action of using.

A natural grammar breakdown is:

• 飼い主 = pet owner
• が = subject marker
• キャリーケース = carrier case / carry case
• を = object marker
• 使う = use

So the structure is basically:

The pet owner uses the carrier case.

Why is を used after キャリーケース?