"Yo necesito usar mi computadora."
Translation:I need to use my computer.
Can somone please explaine the difference between usar, usa, uso to me? Please.
In Spanish, uso does with yo, usas goes with tu, and usa goes with el/ella/usted.
I am wondering if computer needs to agree with the gender's user or if a male can use a computadora?
"Computadora" is a noun, so it doesn't need to agree with anything. As a noun, it has its own gender.
(I may have misunderstood your question; I apologize if I have.)
I get that uso is I use, usas goes with you use and usa goes with he/she uses. But when do I use usar?
I had this same question and I'm still sorting it out, but I think it's usar here because "use" is in infinitive form "to use" and is not the main verb in the sentence. "To use" in this case is functioning as an adverb modifying the main verb "Need".
Since the adverb "to use" is modifying the verb "need" and not a noun, we don't need conjugate ie change the ending from usar to uso.
Aahh yes, you are right! It's being used in its infinitive form next to a conjugated verb. You can't have two conjugated verbs next to each other:
no necesito uso doesn't make sense: I don't need I use.
So usar is used in its pure unconjugated form: usar, to use.
Now it makes sense next to necesito:
No necesito usar: I don't need to use...