You need to know whom you are addressing. If you are not on a first-name basis, use Usted. If you are on a first-name basis, use tú.
Don Francisco = Usted to him, él about him
Maite y Inés = Ustedes (unless your text book uses "vosotros/vosotras" in speaking to them. You need to know if Maite is a girl = Ellas; or a boy = Ellos
Inés y Alex = Ustedes (or vosotros) to them and Ellos about them
la profesora = Usted to her but Ella about her
un estudiante = tú (if you are also a student and you are on a first-name basis) to him but él about him.
Subject Pronouns are
yo = I
tú = you (singular, familiar)
él = he (or it for a masculine noun such as libro)
ella = she (or it for a feminine noun such as casa)
nosotros = WE (all males or one male and many females
nosotros = WE (all females)
ellos = they (people or things all masculine or one male and many females
ellas = they (people or things, but all female)
Talking ABOUT someone is probably
él = he/it
ella = she/it
ellos = they
ellas = they
In the case of Maite, there are no confusion. Maite is a name of a woman (nobody call a man Maite, no in México, everyone laugh of his name, it´s impossible), you must use "ellas".
In the case of Alex, you can use ellas o ellos, you must know his/her gender.
And, you must use "nosotras" if all are females.
My english is not good enough.
"you must know it gender" I guess
spanish sra jmcgin - hi i have a spanish essay draft to write can I scan and ...
Spanish - I have to do a Spanish News report and weather report. I have No idea ...
Fine Art 7 - I have this assignment for my fine art class. You see my art ...
Spanish - I have to translate several words into Spanish, but I have to write ...
spanish - this is my Spanish assignment: Write a letter to a friend in Spanish ...
Geo + eng+ history - Hello, My question is that what kind of environments are ...
Spanish - I need help finding the imports of Guatemala does anyone have a site i...
Spanish - My Assignment for Spanish is to find the major exports & imports for ...
Spanish-one word - Can someone please tell me where I can find how to say "are" ...
Health - I have to do an assignment in my health class but, I'm have a little ...