1. The informal vs. the formal
Tú vs. Ud. Vosotros vs. Uds.
The informal vs. the formal

2. “you” Tú  Ud. (usted) “you guys”, “y’all vosotros  Uds. (ustedes)
INFORMAL FORMAL
“you”
Tú 
Ud. (usted)
“you guys”,
“y’all
vosotros 
Uds. (ustedes)

3. So when do I use them? Ud./Uds. (formal) Tú/Vosotros (informal)
Tú and vosotros are used with family, very good friends, people you would address by their first name, children, pets and the God.
As a general rule, you would use usted and ustedes when addressing strangers, your teachers, people in authority, or a person you address by his or her last name
In some countries, however, children address their parents using the usted form. So when in doubt, it is always best to use the usted or ustedes form until given permission to use the tú form.

4. Práctica. Using the general rules concerning the usage of tú and usted, decide which form is best when addressing:
Ejémplo: Your boyfriend – tú form
1. your best friend
2. your Spanish teacher
3. your best friend’s mother
4. your dog, Pepe
5. your school principal
6. Mrs. Sánchez, your next-door neighbor
7. your brother
8. God (while you pray)
9. your school bus driver
10. your teacher’s five-year-old son
1. tú
2. Ud.
3. Ud. (until told)
4. tú
5. Ud.
6. Ud. (until told)
7. tú
8. tú
9. Ud.
10. tú

5. Práctica. Using the general rules concerning the usage of vosotros and ustedes, decide which form is best when addressing:
Ejémplo: Your boyfriend – tú form
1. your friends
2. your friend’s younger siblings
3. your girl/boyfriend’s parents
4. a group of your teachers
5. an older group of unknown men/women
6. workers in a store
7. your brother and sister
8. a group of kids at the park
9. your coaches
10. your teacher’s five-year-old twin son
1. vosotros
2. vosotros
3. Uds. (until told)
4. Uds.
5. Uds.
6. Uds.
7. vosotros
8. vosotros
9. Uds.
10. vosotros