How do you say the word do in spanish?

This is actually a bit more complicated than it sounds! The easy answer is: "to do" = "hacer" which is the infinitive form (not conjugated, that is does not indicate a person or time)

When you Conjugate the verb, in Spanish you have to change it for each person. For instance in the Present:

I do = Yo hago

You do (singlular informal) = Tú haces

You do (singular formal) = Usted hace

He does = Él hace

We do = Nosotros hacemos

You do (Plural Informal, not used in Latin America) = Vosotros hacéis

They do = Ellos hacen (or Ellas hacen when it's all women doing)

OK, that's the easy part! The more complicated part is the way we use "do" in English, which most other languases don't do! (See what I mean?)

Consider something like: "I walk."

"Do you walk?" "Yes, I do!"

In this case, we use "do" as a sort of auxilliary verb, for emphasis or forming questions. In Spanish, this "do" is not translated directly:

"Do you walk?" = "¿Camina usted?"

"Yes, I do!" = "¡Sí! Camino." (Notice you don't even have to use "Yo" [I] since it's clear from the ending)

That's a rough overview, !