Answer:
1) tu 2) usted 3) usted 4)usted 5) tu 6) usted
Explanation:
usted is used as a form of respect and tu is used for like your friends or someone you've known a long time
Tu is informal, usted is formal.
When using usted instead of tu, you want to think of who you're talking to. Your teacher or your parents would be usted, your friends would be tu.
