What it means
にする expresses choosing or deciding on something, as in selecting an option, and it also expresses making someone or something become a particular state. With a noun, it commonly means choosing that noun. With a な-adjective, it means making something have that quality. With an い-adjective, the adjective changes to its く-form before する. To express deciding to perform an action, use the verb dictionary form followed by ことにする.
Usage note
にする can describe a choice or a change of state, so the surrounding context determines which meaning is intended. For a decision to perform an action, use ことにする rather than attaching にする directly to the verb. The polite counterparts are にします, くします, and ことにします.
How to use it
旅行先は京都にします。
Kyoto is the choice for the travel destination.
会議室を静かにします。
Make the meeting room quiet.
音量を小さくします。
Lower the volume.
毎朝走ることにします。
Decide to run every morning.
旅行先は京都にする。
Kyoto is the choice for the travel destination.
会議室を静かにする。
Make the meeting room quiet.
音量を小さくする。
Lower the volume.
毎朝走ることにする。
Decide to run every morning.
Example sentences
旅行のお土産は青い箱にします。
I will choose the blue box for the souvenir from the trip.
会議の資料は電子版にします。
I will choose the electronic version for the meeting materials.
昼食は駅前のパン屋のサンドイッチにします。
I will choose a sandwich from the bakery in front of the station for lunch.
私は健康のため、エレベーターを使わないで、