YOU SAID:

I need to go to class in half an hour

INTO JAPANESE

私は30分で授業に行く必要があります

BACK INTO ENGLISH

I need to go to class in 30 minutes

INTO JAPANESE

30分でクラスに行く必要があります

BACK INTO ENGLISH

Should go to class in 30 minutes

INTO JAPANESE

30分でクラスに行く必要があります

BACK INTO ENGLISH

Should go to class in 30 minutes