[JLPT grammar] A polite style is not used within quotations

Today I am going to share the homework correction quoted from my JLPT N4 course!
The student’s sentence is not correct. Can you find the mistake?


[Student’s sentence]





[My correction]

I think Tanaka-san will also come.


The polite style (来ます) should not be used before 〜と思います; instead, the plain style (来る) is used. Since と in 〜と思います introduces a quotation, a plain style is required. A polite style is not used within quotations.

I think Smith-san can speak Japanese.


I think that bag is expensive.


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!