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...
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