안 + V
V + 지 + 않다
There’s two different ways to make a negative sentence, either using 안 before a verb or conjugating it with -지 않다
1. Putting 안 before a verb makes it negative and doesn’t change its tense
2. Conjugating the verb by replacing ‘다’ with ‘지 않다’ makes it negative, this way is also slightly more formal.
안 가요. = I’m not going.
먹지 않아요. = I’m not eating.