Spanish Grammar Explained /

Introducing third parties.

I'm sure you have noticed by now that everything in Spanish is harmonious and if something is feminine then everything else is feminine too:
La casa linda.
The beautiful house.
When we want to introduce someone to our friend(s), this harmony comes into play again.
Esta es Ana.
This is Ana.
Estos son Gabriel y Laura.
These are Gabriel and Laura.
Estas son María y Paula.
These are María and Paula.
Watch out, for masculine singular, we use:
Este es Juan.
This is Juan.
Esto es Juan.