“I am from America and I am 15 years. Can you try to guess my gender?”
I’m assuming theres more information to answer this question. I hope this helps though.
You would greet your professor with buenas tardes because it is used from 12pm- 5pm.
I assume you mean the verb conjugation of the present perfect? It's used to talk about things that started in the past, but are still going on right now (in the present) or something that happened recently.
To form it use the past participle of haber + the past participle of another word. For example:
He visto las montañas de Perú
(I have seen the mountains of Peru)
Hemos vuelto para comprar la leche
(We have returned to buy milk)
Habéis cantado muy bien
(You have/You've sung very well)
If you need more info, here is a good place: http://www.spanishdict.com/guide/spanish-present-perfect-indicative
Can you put this in Spanish