[JLPT grammar] A decision made on one’s own or determination, ことにする? ことになる?

Today I am going to share the homework correction quoted from my JLPT course!
The student’s sentence is not correct. Can you find the mistake?


[Student’s sentence]





[My correction]

I decided to propose to my girlfriend

You should use ことにする because to propose was what you wanted.

ことにする indicates a decision made on one’s own or determination, ことになる indicates that something was decided by an organization or system.

My old computer broke down and I decided to buy a new one.

I was tired and decided to take a taxi home.

Our company will not be working overtime starting this week.

The school wants us to be at school by 7:00 a.m. tomorrow.


I hope my explanation helps you. 😊


In the JLPT course, all lessons come with homework, if you submit your homework, I will reply with corrections.
I can break down the Japanese grammar and point out mistakes, explaining the structure and nuances of Japanese in an easy-to-understand way.
You can also ask me any questions as much as you want. I will teach you until you get it!