The lesson

8.3 Choosing vs becoming

AI-generated

Overview

These two patterns are used to describe change, but the key difference is control.

  • ~に — a decision made by someone
  • ~に — a change that happens (naturally, automatically, or by circumstances)

~にする — deciding / choosing

~にする is used when someone actively decides or chooses something.

Structure:

  • Noun + にする
  • な-adjective + にする
  • い-adjective → adverb form (replace い with く) + する

For example:

It’s hot, so I’ll turn the air conditioner up.

~になる — becoming / ending up as

~になる describes a resulting state. The change happens without emphasizing a personal decision.

Structure:

This road will become wide.
It turned into rain.

~にする vs ~になる (summary)

  • ~にする — someone chooses or makes something so
  • ~になる — something becomes so as a result
I’ll choose (someone) as the teacher.
I will become a teacher.

~ことにする — deciding to do something

~ことにする is used when you decide to do (or not do) something. It emphasizes a deliberate decision.

Structure:

  • Verb (plain) + ことにする

~ことになる — it is decided / it turns out that

~ことになる describes something that is decided by circumstances, rules, or other people. The speaker is not emphasizing their own will.

Structure:

  • Verb (plain) + ことになる
It has been decided that I will go to Japan next month.
It was decided that the meeting would be canceled.

~ことにする vs ~ことになる

  • ~ことにする — decision made by the speaker
  • ~ことになる — decision/result caused by external factors
I decided to go to bed early.
It ended up being decided that I would go to bed early.

Points to keep in mind

  • ~にする = choose / decide
  • ~になる = become / end up
  • ~ことにする = decide to do something
  • ~ことになる = it is decided / it turns out

Dialogue

。きごう「きごう」。、。。、。、、。、。きごう「きごう」。。。、。

It has been decided that I will start a new job from next month. That's because the company told me they wanted me to transfer to the Tokyo office. At first I was unsure, but I decided to move. I decided to make my place of residence somewhere near the company. When I looked for a room, I found a good property. The rent is a little expensive, but since the transport links are convenient, I decided to go with this place. It seems that at the new workplace, I will be in charge of sales at first. My supervisor told me to value my own goals in the new department. From now on, I decided to make both my work and my life simple. I want to try to gradually get used to my new environment. This change is also something I feel anxious about, but I believe it will turn into something good.

Grammar

TitleDescription
~にする
~にする / ~ことにする — decide or choose to do something

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