watasi ha nooto wo tomodati to kyouyuusimasu.

In Japanese, は (pronounced wa) is the topic marker, not a subject marker. It tells the listener “we’re talking about me.”

• It sets 私 (“I”) as the context for everything that follows.
• It doesn’t itself mean “I,” but highlights that the sentence is about 私.

を marks the direct object of the verb.

• ノートを共有します literally means “(I) share the notebook.”
• Without を, the verb wouldn’t know what you’re sharing.

と here means “together with” or “and,” indicating the person you share with.

• 友達と共有します = “share with a friend.”
• に would mark a beneficiary (“I give to a friend”), but と emphasizes mutual action.

Yes. 共有する is a suru-verb (a verb formed by adding する).

• You treat 共有 (a noun) plus する as a single verb meaning “to share.”
• In polite form it becomes 共有します.

Using ます form (polite form) makes the sentence more formal or respectful.

• 私 は ノート を 友達 と 共有します。 is appropriate for school, business, or polite conversation.
• You can use dictionary form (共有する) in casual contexts: ノートを友達と共有する。

Yes. In Japanese you often omit the topic if it’s clear from context.

• If the listener already knows you’re the one doing the sharing, 私は is unnecessary.
• Omitting it makes your speech more natural and concise.

Japanese word order is relatively flexible, but there are conventions:

• The topic (marked by は) usually comes early: 私は…
• Objects (marked by を) and “with” phrases (marked by と) can swap places: both ノートを友達と共有します and 友達とノートを共有します are fine.
• The verb almost always goes at the end in standard sentences.
• Avoid splitting the verb from its particles; 共有します stays together at the end.