Telling you've decided on something with に する

You can use the phrase に する to tell that you have decided on something.

This phrase is also often used in restaurant setting.

What have you decided on? / What will you have?
なん に します か。nan ni shimasu ka.
Decision: I'll have coffee.
コーヒー に する。koohii ni suru.

You can also use に しましょう to propose a decision.

You can use にする after verbs by nominalizing the verb with the suffix 〜こと.

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