kyou no jugyou no pointo o memo ni kakimashita.

direct object particle

Breakdown of kyou no jugyou no pointo o memo ni kakimashita.

• 今きょ日う: today
• の: possessive case particle
• 書かく: to write

Questions & Answers about kyou no jugyou no pointo o memo ni kakimashita.

What is the role of の in 今日の授業のポイント? Why is の used twice?

の is a particle that often shows possession or a close relationship between two nouns, similar to 's or of in English.

• 今日の授業 → today’s class
  • 今日 (today)
    • の
      • 授業 (class) → the class of today / today’s class
• 授業のポイント → the main points of the class
  • 授業 (class)
    • の
      • ポイント (points) → the points of the class / the class’s points

Putting them together:

• 今日の授業のポイント → the points of today’s class

Using の twice simply chains the relationships:

• (今日 の 授業) の ポイント → the points of (the class of today)

Why is there no subject like “I” in the sentence? How do we know who wrote it?

In Japanese, the subject is often omitted when it is clear from context.

書きました is polite past tense, and in a normal conversation about your own actions, it is automatically understood as “I wrote” (or “we wrote” if you’re speaking for a group).

So:

• 今日の授業のポイントをメモに書きました。 → Contextually: “(I) wrote the main points of today’s class in my notes.”

If you really wanted to include the subject, you could say:

• 私は今日の授業のポイントをメモに書きました。 But in natural Japanese, 私 is usually dropped unless you need to contrast or clarify who did it.