Question

Can someone please tell me everything I need to know for mandatos de tu y usted? Thanks! xoxoxo<3

Answer 1

=== TÚ COMMANDS (aka informal commands) ===
Affirmative: Do something
- Conjugation: Conjugate verb into present indicative form of "él/ella/usted"
- Example: "Eat the food." => "Come la comida." (See how it's not "comes"?)
"Buy the shirt." => "Compra la camiseta."

Negative: Don't do something
- Conjugation: Conjugate verb into subjunctive form (aka opposite ending, but still in "tú" form)
- Example: "DON'T eat the food." => "No comas la comida."
"Don't buy the shirt." => "No compras la camiseta."

Answer 2

For the informal commands, remember the irregulars: (I have included some examples.)

decir - di (Say the word. => Di la palabra.)
salir - sal (Leave the room. => Sal el dormitorio.)
hacer - haz (Do the homework. => Haz la tarea.)
ser - sé (Be nice. => Sé simpático.)
ir - ve (Go to the class. => Ve a la clase.)
tener - ten (Have a book. => Ten un libro.)
poner - pon (Put (make) the table. => Pon la mesa.)
venir - ven (Come to the party. => Ven a la fiesta.)

Answer 3

=== USTED COMMANDS (aka formal commands) ===
Affirmative:
- Conjugation: Conjugate verb into present but drop ending and add opposite
(For -ar, use -e ending. For -ir/-er use -a ending)
- Example: "Eat the food. (formal)" => "Coma usted la comida." (See the pattern?)
"Buy the shirt." => "Compre usted la camiseta."

Negative:
- Conjugation: Same as affirmative. Just add a 'no' in front.
- Example: "Don't eat the food." => "No coma usted la comida."
"Don't buy the shirt." => "No compre usted la camiseta."

* * * Remember that with all of these, start by using the "yo" present form. Drop the -o, and add the opposite ending.
* * * Remember the irregular present "yo" form verbs. (i.e. Yo tengo. The form will carry over to the command. "Have a cake." => "Tenga usted un pastel."

Irregular formal commands: (And some examples.)
dar - dé Ud. (Give the gift. => Dé usted el regalo.)
estar - esté Ud. (Be excited. => Esté usted emocionado.)
ir - vaya Ud. (Go to the library. => Vaya usted a la biblioteca.)
ser - sea Ud. (Be nice. => Sea simpático.)
saber - sepa Ud. (Know the word. => Sepa la palabra.)
(See a difference between the informals?)

Hope that it helps!! (It's long but very informative. :P)