Esta, este, esto.....
When to use each...
I believe the following: estoy is singular (Yo)? Estan is used for "We" or "Our" plural sentences (nosotros)? I am guessing based on the phonetic sound and getting them right most of the time but I would like to be certain and if anyone can provide an insight that would help.
You are talking about two different things:
- Verbo estar:
Él / ella / usted está.
Ellos / ustedes están.
The words of the subject are different. Esta, este and esto are demostratives ("this" in different genders and as a subject).
Esto is always a noun and it is used alone when refering to inanimated objects or ideas. "Esto es inútil" -> "This is useless", "Esto no es lo que me dijiste" -> "This is not what you told me".
Este and esta can be wether nouns (in this case should be accented) and be used alone: "Ésta no es mi bicicleta" (bicycle is a feminine noun) -> "This is not my bike", "Éste volvió pronto" -> "[He/This one] came back soon".
Or adjectives (not accented): "Este hombre es español" -> "This man is Spanish", "Esta casa es roja" (house is a feminine noun) -> "This house is red".
I hope this helps!