Lo siento mucho.
perdoname
English = I am sorry also Spanish = lo siento también
Christa is "Christa" in Spanish. It has no spanish version. Sorry...:(
To say, "I am sorry for [those] who don't appreciate Spanish," you say, "Lo siento por quienes no aprecian el español."
lo siento
Lo siento mucho que él está loco.
If he wants you to say sorry, then you can. You can say either "Really Sorry" or "Very Sorry".
Perdona por eso
Lo siento, no.
Lo Siento
lo siento
Fiona is just a name, it doesen't exist in Spanish, sorry.