Is he a worker? -No, he isn't - Yes, he is
Was I in Crimea? -No, I wasn't - Yes, I was
Does my mother cook well? -No, she doesn't - Yes, she does
Do we have a test? - No, we don't - Yes, wo do
Did the students repeat the words? -No, they didn't - Yes, they did
Did I see this film? -No, I didn't - Yes, I did
Do I know him? -No, I don't - Yes, I do
Will you graduate from the institute? -No, I won't - Yes, I will