Grammatical Rules
Form
.
Sujeto	Auxiliar (to be)	Gerundio
I	am	talking, eating, learning, doing, going...
He, She, It	is	talking, eating, learning, doing, going...
You, We, They	are	talking, eating, learning, doing, going...undefined
Structure
Affirmative Sentences
I'm talking
He's eating

They're learning
PRESENT CONTINUOUS
Topic principal
Structure 
Negative Sentences

I'm not talking
He's not [He isn't] eating
