1. 그는 자주 소리를 지른다.

He often scream -------> He often ​screams. / He often shouts.

=> Corrected : The sentence is corrected grammatically.

(Punctuation)

2. 우리는 가끔 커피를 함께 마신다.

we sometimes drink coffee together -------> ​We sometimes drink coffee together.

(Punctuation)

(capitalization)

3. 난 가끔 술을 마신다.

I sometimes drink -------> ​I occasionally drink.

(Punctuation)

​