Question

Explain how to form the usted form of the imperative of the regular ar verb hablar.

Answer 1

When you conjugate a verb, hablar for example, it has five different out comes. 
Yo - Hablo
Tu - Hablas
El, Ella, Usted - Habla
Nosotros, Nosotras - Hablamos
Ellos, Ellas, Ustedes - Hablan

Answer 2

All at verbs go o, a, as,Amos, an there is a song on YouTube also to help you remember it