交換します（こうかんします、koukanshimasu）
- exchange

The Japanese word 交換します, pronounced こうかんします (kōkan shimasu), means "to exchange," "to swap," or "to trade." It implies the act of giving something and receiving something else in return, often of equal or similar value. The "します" (shimasu) at the end indicates that it's a polite, formal verb form. The core idea is a transaction where items, information, or even actions are given and received.

⚫︎本を交換します。 Translation: I will exchange the books. ⚫︎友達と電話番号を交換します。 Translation: I will exchange phone numbers with my friend. ⚫︎壊れたものを新しいものと交換します。 Translation: I will exchange the broken item for a new one.

⚫︎ Use 交換します in situations where you are actively trading or swapping something. ⚫︎ It's suitable for both formal and informal settings, although its polite form makes it more appropriate for slightly formal situations or when speaking to someone you respect. ⚫︎ You can use it in various contexts such as exchanging goods, information, or even apologies. ⚫︎ Often, you'll specify *what* you're exchanging using the particle を (o), and *with whom* you're exchanging it with, using the particle と (to).

⚫︎ 交換します is typically written in kanji and hiragana: 交換します. ⚫︎ 交換 (kōkan) itself means "exchange" and is written with the kanji 交換. The verb suffix "します" (shimasu) is always in hiragana. ⚫︎ There are no common variations in the okurigana (the suffix hiragana). The stem is 交換. ⚫︎ The present/future polite form is [交換します]. ⚫︎ The past polite form is [交換しました] (kōkan shimashita - exchanged). ⚫︎ The present/future negative polite form is [交換しません] (kōkan shimasen - will not exchange). ⚫︎ The past negative polite form is [交換しませんでした] (kōkan shimasen deshita - did not exchange).

⚫︎ 取り替える (torikaeru) - to replace, to exchange (often used for replacing broken items). ⚫︎ 交換する (kōkan suru) - a less polite, but often interchangeable, form of [交換します]. ⚫︎ トレードする (torēdo suru) - to trade (borrowed from English "trade," often used for sports trading).

There isn't a single direct antonym for [交換します], but you could consider the opposite of the action it describes: ⚫︎ Keeping/not giving: Not exchanging anything. ⚫︎ Receiving without giving: receiving something without providing anything in return.

新しいスマートフォンを古いものと[交換します]か？ ・Translation: Would you like to exchange your new smartphone for your old one? ・Explanation: This sentence uses [交換します] to ask if someone wants to trade a new smartphone for an old one, a typical scenario where you'd use this verb.

あの店で返品して、別のサイズと[交換しました]。 ・Translation: I returned it at that store and exchanged it for a different size. ・Explanation: This shows [交換しました] in the past tense, describing the successful exchange of an item.

The kanji 交 (kō) means "to cross," "to mingle," or "to exchange," and 換 (kan) means "to change" or "to convert." Therefore, 交換 is a compound word that literally means "to cross and change," perfectly capturing the idea of exchanging one thing for another. The verb suffix "します" (shimasu) is a common way to make a noun into a polite verb.