Answer:
It would be "Yo <u>estoy</u> en la casa de mi amiga"
Explanation:
The word estoy means that you are in a specific location. The sentence translates to" I ___ at my friend's house." Therefore, the correct verb to go in the blank is estoy because it is a location.
Take note: estoy is ESTER verb
Nosotros compramos y vendemos.
Yo siempre digo la verdad.
You can use any form of the verb, but it has to be indicative. I have used the <u>present form</u> (the most used in these cases) of the verb "decir" (say).
<h3><em><u>MissSpanish</u></em></h3>