watashi wa nihongo no moji o nooto ni kakimasu.

I write Japanese characters in my notebook.

Breakdown of watashi wa nihongo no moji o nooto ni kakimasu.

• は: topic particle
• 私わたし: I
• を: direct object particle

Questions & Answers about watashi wa nihongo no moji o nooto ni kakimasu.

What does the particle は do in this sentence, and why is it pronounced wa?

は here is the topic marker. It tells you what the sentence is about.

• 私 は = As for me / I
• The rest of the sentence says what is true about that topic: I write Japanese characters in a notebook.

Even though it’s written は, when used as the topic particle it’s always pronounced wa, not ha.
Inside normal words like はな (nose/flower) it’s pronounced ha; only as the topic particle it’s wa.

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Why do we use 私 は and not 私 が here?

Both は and が can attach to 私, but they have different roles:

• 私は: sets me as the topic (what we’re talking about). Neutral, common, and natural here.
• 私が: marks me as the grammatical subject, often with a nuance like “I (as opposed to someone else) am the one who…”.

In a simple neutral statement like this, Japanese usually prefers a topic:

• 私 は 日本語の文字をノートに書きます。
  = As for me, I write Japanese characters in a notebook.

If you said 私が日本語の文字をノートに書きます, it could sound like you’re emphasizing I’m the one who does it, in contrast to others.

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