Voy a contestar a su e-mail.

I'm going to [answer/reply to] his email.

1. ¡Contéstame!
   Answer me!
2. No contesto a Daisy cuando me ladra.
   I don't reply to Daisy when she barks at me.
3. ¿Cuánto tiempo tardas en responder a mis preguntas?
   How long does it take you to answer my questions?
4. Siempre intento responder a toda la gente que me escribe en mi cumpleaños.
   I always try to reply to everybody who texts me on my birthday.
5. Cuando termine este programa voy a responder a todos mis emails.
   When this program finishes I'm going to reply to all my emails.