What it means
にする expresses choosing one option or deciding on a course of action. With a noun, it means to choose that thing, often when selecting food, drinks, plans, or other options. With a verb in the dictionary form followed by ことにする, it means to decide to do something. The familiar form ends in にする, while the polite form ends in にします.
Usage note
Do not confuse にする with になる. にする describes a person's choice or decision, while になる describes a change or result that happens or is established. The pattern [verb dictionary form]ことにする is used for deciding to do an action; the noun pattern usually means choosing an option.
How to use it
私はお茶にします。
I will choose tea.
来週から毎朝走ることにします。
I have decided to run every morning starting next week.
私はお茶にする。
I will choose tea.
来週から毎朝走ることにする。
I have decided to run every morning starting next week.
Example sentences
昼ご飯は駅の近くの店でカレーにします。
I will choose curry for lunch at the restaurant near the station.
週末の旅行は電車で行くことにします。
For the weekend trip, I have decided to go by train.
夏休みの宿題は毎日少しずつすることにします。
I will decide to do my summer vacation homework little by little every day.
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