kyou no zemi ha kyouzyu no tugou de kyuukou ni natta node, aita zikan ni repooto no tensaku wo site moraimasita.

今日のゼミ means today’s seminar/class. Here, 今日 directly modifies ゼミ using の, just like a noun modifying another noun.

• 今日のゼミ = today’s seminar
• 今日はゼミ would mean as for today, (it’s) a seminar..., which is a different structure and does not mean the same thing.

So in this sentence, 今日のゼミは... sets up the seminar scheduled for today as the topic.

ゼミ is short for ゼミナール, and in Japanese university contexts it usually means a seminar class, small-group academic class, or sometimes a research seminar/lab group led by a professor.

So 今日のゼミ is not just any class; it often suggests a more specialized university seminar.

教授の都合で means because of the professor’s circumstances or for reasons related to the professor’s schedule/convenience.

Breakdown:

• 教授 = professor
• の都合 = the professor’s circumstances / availability / scheduling situation
• で = indicates the cause or reason in this kind of expression

So Xで can sometimes mean due to X or because of X.

Here, 教授の都合で休講になった means the class was canceled due to the professor’s circumstances.

都合 often gets translated as convenience, but in many real sentences it is better understood as:

• schedule
• availability
• circumstances
• things someone has going on

So 教授の都合 does not necessarily mean the professor canceled class just for personal convenience in a selfish sense. It usually means something more neutral like because of the professor’s schedule/circumstances.

休講 means class cancellation or a canceled class.

The pattern Noun + になる means to become / to end up as that noun state.

So:

• 休講になった = it became canceled / it was canceled
• 休講だった = it was a canceled class or it was canceled, but this sounds more like describing the state rather than the event of cancellation

In Japanese, 休講になる is very common for saying that a class got canceled.

ので means because or since. It connects the reason to the result:

• 今日のゼミは教授の都合で休講になったので
  = because today’s seminar was canceled due to the professor’s circumstances...

Compared with から, ので usually sounds:

• a bit softer
• a bit more explanatory
• a bit less direct

Both could work in many cases, but ので is especially common when calmly explaining a situation.

空いた時間 means free time or more literally the time that opened up.

Breakdown:

• 空く = to become empty / to become available / to open up
• 空いた = past form of 空く
• 空いた時間 = the time that became available

Japanese often uses a plain past form before a noun to describe it. This is a relative clause.

So 空いた時間 is not necessarily emphasizing past time in English; it is describing the time that became free because the seminar was canceled.

In 空いた時間に, the particle に marks the time when something happened.

So:

• 空いた時間にレポートの添削をしてもらいました
• During the free time / in the time that opened up, I had my report corrected

This に works like at or during with time expressions.

レポートの添削 means the correction/revision of a report.

Breakdown:

• レポート = report / paper / written assignment
• 添削 = correcting written work, often with detailed marking or feedback

添削 is commonly used for:

• essays
• reports
• compositions
• homework writing
• language writing practice

It is more specific than a general word like fixing. It suggests checking the writing and marking errors or improvements.

〜てもらう means to have someone do something for you or to receive the favor of someone doing something.

So:

• 添削をしてもらいました = I had someone correct it for me = someone corrected it for me

This expression focuses on the speaker receiving the benefit of the action.

So the nuance is not just the report was corrected, but I got it corrected by someone.

The sentence does not explicitly say it, but the most natural assumption is the professor, because the professor was just mentioned and the context is academic.

So the implied meaning is probably:

• I had the professor correct my report during the free time

Japanese often leaves subjects and agents unstated when they are clear from context.

レポートの添削 literally means report correction or the correction of the report. Japanese often leaves out possessive words like my when they are obvious from context.

Since the speaker says してもらいました, it is natural to understand that it was the speaker’s report that got corrected.

So even without 私のレポート, the meaning is understood as my report.

They are all the particle の, but they connect nouns in slightly different relationships.

Examples:

• 今日のゼミ = today’s seminar
• 教授の都合 = the professor’s circumstances
• レポートの添削 = correction of a report / report correction

So の is very flexible. It can show:

• possession
• association
• category
• description
• part-whole relationships

A good general way to think of it is: the noun before の modifies the noun after it.

Yes. The sentence ends with もらいました, which is the polite past form of もらう.

So the overall tone is polite but fairly neutral and natural. It is appropriate in normal conversation or writing.

It is not extremely formal. In a more formal or more respectful style, someone might use a different expression depending on the context, but this sentence is perfectly natural as-is.

The sentence is basically:

[Reason] ので, [what I did as a result].

More specifically:

• 今日のゼミは教授の都合で休講になったので、 = Because today’s seminar was canceled due to the professor’s circumstances,

• 空いた時間にレポートの添削をしてもらいました。 = I had my report corrected during the free time that opened up.

So the flow is:

1. the seminar got canceled
2. that created free time
3. the speaker used that time to get their report corrected