Asking About the Past

To negate a verb put 안 [an] before the verb.

영화를 봐요. [yeong-hwa-reul bwa-yo]
I watch a movie.

↓

영화를 안 봐요. [yeong-hwa-reul an bwa-yo]
I don't watch movies.

아침을 먹어요. [a-chim-eul meo-geo-yo]
I eat breakfast.

↓

아침을 안 먹어요. [a-chim-eul an meo-geo-yo]
I don't eat breakfast.

안 봤어요. [an bwa-sseo-yo]
I didn't see it.

• 안 [an] means "not"
• 봤어요 [bwa-sseo-yo] means "I saw."
• Literally means "Not, I saw"

커피를 안 마셔요? [keo-pi-reul an ma-syeo-yo?]
Do you not drink coffee?

• 커피 [keo-pi] means "coffee"
• 를 [reul] is a particle that marks a subject
• 안 [an] means "not"
• 마셔요? [ma-syeo-yo?] means "do you drink (it)?"
• Literally means "coffee, not, do you drink?"

아니요, 안 먹었어요. [a-ni-yo, an meo-geo-sseo-yo]
No, I didn't eat.

• 아니요 [a-ni-yo] means "no"
• 안 [an] means "not"
• 먹었어요 [meo-geo-sseo-yo] means "I did not eat."
• Literally means "No, not, I did not eat."

• A: 지난주에 숙제했어요?
  Did you do homework last week?
• B: 아니요, 안 했어요. [a-ni-yo, an hae-sseo-yo]
  No, I didn't do it.
• A: 어제 책을 읽었어요?
  Did you read a book yesterday?
• B: 아니요, 안 읽었어요. [a-ni-yo, an il-geo-sseo-yo]
  No, I didn't read it.