"I speak English."

Translation: Eu vorbesc limba engleză.

[Amir.pro]

Where engleza and where engleză?

[Luchtmens]

Eu vorbesc engleza and Eu vorbesc engleză are both fine translations for "I speak English".

[VictorBeha1]

What is the function of limba?

[Ins862171]

Limba means language, so when you say "limba româna" it means "Romanian language", while "româna" is just "romanian"

[mschmo]

So why not "limba englaza"?

[AnaTechWr]

Because it is implied, and someone can understand that you are referring to the language. It is basically the same structure as in English - "I speak English" and "I speak the English language". Same meaning, less words for the former.