[JLPT grammar] Only nouns and na-adjectives can add だ before から

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]





[My correction]

I don’t want to study kanji because it is difficult.

When から indicates reason or cause, only nouns and na-adjectives can add だ before から.
難しい is an i-adjective, so nothing is added before から.

I don’t study it because it’s difficult.

I buy that because it is convenient.

He is a teacher, so he knows everything.


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!