Today I am going to share the homework correction quoted from my JLPT N5 course!
The student’s sentence is not correct. Can you find the mistake?

 

[Student’s sentence]

一週間で二回、ジムに行きます。

*いっしゅうかんでにかい、じむにいきます。

 

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[My correction]

一週間で二回、ジムに行きます。
→一週間に二回、ジムに行きます。
I go to the gym twice a week.

 

に is used with frequency expressions such as per hour, per day, etc.

[Quantifier (time period)] に [how many]

 

e.g.
一日に10こ、漢字(かんじ)をおぼえます。
I learn 10 kanji a day.

一週間(いっしゅうかん)に25時間(じかん)働(はたら)きます。
I work 25 hours per week.

オリンピックは四年(よねん)に一回(いっかい)、行(おこな)われます。
The Olympics are held once every four years.

As you may know, に is the particle having the most various functions, and this is just one of them.

 

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 in as much detail as you want. I will teach you until you get it!