keiyaku no zyouken wo kakuninsita.

の links two nouns and shows a relationship between them.

Here, 契約の条件 means the conditions of the contract or the contract's terms/conditions.

So:

• 契約 = contract
• 条件 = conditions / terms
• 契約の条件 = the contract's conditions

In English, we often translate this as the terms of the contract.

を marks the direct object of the verb.

In this sentence, the thing being confirmed is 契約の条件, so that whole noun phrase is marked by を:

• 契約の条件を確認した
• confirmed the contract terms

So を tells you what was confirmed.

確認 by itself is a noun meaning confirmation/check, but it can also act as a verbal noun when combined with する.

So:

• 確認する = to confirm / to check
• 確認した = confirmed / checked

This is very common in Japanese. Many Sino-Japanese nouns become verbs with する.

Examples:

• 勉強する = to study
• 連絡する = to contact
• 確認する = to confirm

確認した is the plain past form.

That means the action is presented as completed:

• 確認する = confirm / will confirm
• 確認した = confirmed

Depending on context, it could mean:

• I confirmed
• We confirmed
• Someone confirmed

Japanese often leaves the subject unstated if it is obvious from context.

Japanese often omits the subject when it is understood from context.

So 契約の条件を確認した。 can naturally mean:

• I confirmed the contract terms
• We confirmed the contract terms
• He/She confirmed the contract terms

English usually needs a subject, but Japanese often does not.

This is one of the most common differences between English and Japanese.

Yes, but Japanese word order is different from English.

This sentence follows the common Japanese pattern:

[object] + を + [verb]

So:

• 契約の条件 = contract terms
• を = object marker
• 確認した = confirmed

Japanese verbs usually come at the end of the sentence.

So even though English says confirmed the contract terms, Japanese says contract terms confirmed in terms of word order.

Yes. In normal Japanese, it would usually be written as:

契約の条件を確認した。

Spaces are often added in learning materials to make the structure easier to see, but standard Japanese normally does not use spaces between words like English does.

The sentence is read:

けいやく の じょうけん を かくにんした。

Word by word:

• 契約 = けいやく
• の = の
• 条件 = じょうけん
• を = を (pronounced お in modern Japanese)
• 確認した = かくにんした

In this context, 条件 can often be translated naturally as terms or conditions.

For contracts, English often prefers:

• the contract terms
• the terms of the contract

A very literal translation is conditions, but in business/legal English, terms is often more natural.

So the Japanese is broad enough to cover both, depending on context.

Yes, but it means something a little different.

• 契約を確認した = confirmed/checked the contract
• 契約の条件を確認した = confirmed/checked the contract's terms

The original sentence is more specific. It focuses on the terms/conditions, not necessarily the entire contract document.

The polite version is:

契約の条件を確認しました。

Compare:

• 確認した = plain past
• 確認しました = polite past

Use 確認しました in formal conversation, business situations, or when speaking politely.

It can mean either, depending on context.

確認する often means:

• to confirm
• to check
• to make sure

So 契約の条件を確認した could be understood as:

• I confirmed the contract terms
• I checked the contract terms
• I made sure about the contract terms

In business contexts, confirmed or checked are both common translations.