syuuri no kanryou wo kakuninsimasita.

It is read:

しゅうり の かんりょう を かくにんしました

Word by word:

• 修理 = しゅうり
• の = の
• 完了 = かんりょう
• を = を
• 確認しました = かくにんしました

修理の完了 is a noun phrase meaning the completion of the repair or the repair being complete.

A useful way to see it is:

• 修理 = repair
• 完了 = completion
• 修理の完了 = completion of the repair

So the sentence is talking about confirming that the repair had been completed.

Here, の links two nouns.

It often works a bit like of in English. So:

• 修理の完了 = completion of the repair

This is very common in Japanese. Noun + の + noun can show many relationships, but here it is specifically showing what was completed.

Similar patterns:

• 仕事の開始 = the start of the work
• 作業の終了 = the end of the task
• 工事の中止 = the cancellation of the construction

を marks the direct object of the verb.

The thing being confirmed is:

• 修理の完了

So:

• 修理の完了を確認しました
• confirmed the completion of the repair

A literal structural breakdown would be:

• 修理の完了 = completion of the repair
• を = object marker
• 確認しました = confirmed

確認しました is the polite past form of 確認する.

Breakdown:

• 確認 = confirmation, checking
• する = to do
• 確認する = to confirm, to check
• 確認しました = confirmed

This is a very common type of word in Japanese: a noun plus する becomes a verb.

Other examples:

• 勉強する = to study
• 連絡する = to contact
• 説明する = to explain

So 確認しました is not a completely separate word from 確認; it is 確認する conjugated into polite past.

Japanese often leaves out the subject when it is understood from context.

So 修理の完了を確認しました could mean:

• I confirmed the repair was complete
• We confirmed the repair was complete
• The staff confirmed the repair was complete

The sentence itself does not state who did it. In Japanese, that is very normal. The listener usually knows from the situation, the speaker, or the surrounding sentences.

No. That is an important point.

This sentence means that someone confirmed the repair was complete. It does not say that the speaker personally performed the repair.

Compare:

• 修理しました = repaired it
• 修理の完了を確認しました = confirmed the repair was complete

So the action here is confirming, not repairing.

Yes, it is natural, but it sounds fairly formal and businesslike.

You might see or hear it in contexts like:

• work reports
• maintenance logs
• customer service communication
• technical support
• office emails

It is less like casual conversation and more like an official statement.

In casual speech, someone might say something more direct depending on context, but this sentence is perfectly normal in formal Japanese.

Yes, you could.

• 修理の完了を確認しました
• 修理が完了したことを確認しました

Both are natural and similar in meaning, but the nuance is a little different.

修理の完了を確認しました

This is more compact and noun-based. It sounds a bit more formal and administrative.

修理が完了したことを確認しました

This spells out the event more clearly: I confirmed that the repair had been completed.

So:

• the first version is concise and report-like
• the second version feels slightly more explanatory

Japanese formal writing often prefers compact noun phrases like 修理の完了.

By itself, 完了 is mainly a noun, meaning completion.

That is why it fits naturally in:

• 修理の完了 = the completion of the repair

But like many Sino-Japanese nouns, it can also be used with する:

• 完了する = to be completed / to complete

Examples:

• 作業が完了しました = the work has been completed
• 設定が完了しました = the setup is complete

So in your sentence, 完了 is functioning as a noun inside a larger noun phrase.

Because 修理完了 and 修理の完了 are not always used in exactly the same way.

修理の完了 is the more standard grammatical phrase meaning completion of the repair.

修理完了 can exist as a compact compound expression, especially in labels, notices, or headings, but it sounds more compressed, like technical or written shorthand.

For a full sentence, 修理の完了を確認しました is the safer and more natural choice for learners.

Yes. 確認する often covers both ideas.

Depending on context, it can mean:

• checked
• confirmed
• verified
• made sure

In this sentence, confirmed or verified usually fits best, because the speaker is not just looking at something casually; they are making sure the repair has been completed.

That nuance is why 確認する is very common in workplaces and formal situations.