watashi wa kuuki o yukkuri suimasu.

I slowly inhale air.

Breakdown of watashi wa kuuki o yukkuri suimasu.

• は: topic particle
• 私わたし: I
• を: direct object particle
• ゆっくり: slowly

Questions & Answers about watashi wa kuuki o yukkuri suimasu.

Why is 私 included here? Can Japanese leave out I?

Yes. Japanese very often leaves out the subject when it is obvious from context.

So 私は空気をゆっくり吸います。 is grammatical, but in real conversation you might also hear:

• 空気をゆっくり吸います。

That would still often be understood as I slowly inhale air if the speaker is talking about themself.

私 is included here because:

• it makes the subject explicit,
• it is helpful for learners,
• it can add contrast or clarity.

Why is the particle は used after 私?

は marks the topic of the sentence. Here, 私は means something like:

• As for me, ...
• I, ...

It tells the listener what the sentence is about.

In this sentence, 私は空気をゆっくり吸います。, the topic is 私, and then the rest says what that person does.

A natural way to think of it is:

• 私は = as for me
• 空気をゆっくり吸います = slowly inhale air

Why not use が instead of は?