A. Make three sentences using the word "store".

I didn't store my homework.  (Correct)

You should store your work. (Correct)​

He don't know how to store his data. --> He doesn't know how to store his data.

=> Corrected: The sentence is corrected grammatically.​

B. Make these sentences into English.

(05/20/21)

-아우, 헷갈려요. 이 문제는 저한테 너무 어려워요.

-땡땡땡

-마칠 시간 이예요.

-Oh, I'm confused. This problem is too different to me. --> Oh,  I'm confused. It's difficult for me.

-Ding Dong Dang Dong. --> Ring Ring Ring

=> Corrected: The sentence are corrected grammatically.​

-It's time to finish. --> Time's up.

=> Your sentence has a correct grammatical structure, but this has the correct usage/expression.​