-지요? is used when the speaker wants to confirm with the listener or to obtain the listener's agreement about something already known. It means 'Isn't/Aren't...?' or 'Don't/Doesn't...?' in English. For present tense adjectives and verbs, -지요? is added to the stem. For past tense adjectives and verbs, -았/었지요? is added; for future tense verbs, -(으)ㄹ 거지요? is added. In colloquial speech, -지요? is sometimes shortened to -죠?

Kimchi Reader

Used when the speaker want to confirm an already known fact with the listener or obtains the listener's agreement.