Use for an action happening right now at the moment speaking
You are reading book
To talk about something around the time of speaking but not necesarily at this exact moment( situacion is temporary)
I am reading a great book
Common time expresion used with the Present Continuous are
now, right now, at the moment, still
Afirmative
I am eating cereal right now
Negative
I am not eating cereal rigth now
Interrogative
Are you eating cereal right now?
What are you reading?
Use for facts or things that are always true or generally true
A lion has four legs
Regular habits or repeated actions(daily rutins)
I brush my teeth three times a day
Subtopic
Common time expresion used with the Present Simple are
Always, often, generally,sometime, never
Every day, every week, every year
once a day, twicw week
On Monday, on friday
In the mornig, in the afternoon, at night
Afirmative
I eat cereal every day
Negative
I do not eat cereal every day
Questions
Do you eat cereal every day?
What do you do?