I think you mean conjugation, but anyhow it depends on how you are using it..
Answer:
Tú is not formal, while usted is. You use tú with friends and family and such, and usted with, for example, your teacher or the president.
Hola, sabes que he conocido a dos personas muy agradables. Una de ellas se llana Luisa y la Marina. Luisa es mexicana. Marina es española. .
I have written an <u>introduction</u> to make it more realistic.
The phrases that are highlighted are the ones asked in the exercise.
<h3><em><u>MissSpanish</u></em></h3>
Pedir preferir recomendar servir
