I have practiced Karate since I was in elementary
I have been working for this company for 5 yerars
I haven't finished my homework yet
I have already finished reading the book you lent me
I have never been to Europe
It has been raining all this week
I have just lost my keys
I have worked as a teacher for 10 years
An activity we know is finished although we don't know exactly when
An experience
An activity which happened not long ago but we don't know exactly when, how or where it happened
we know how long an activity has lasted and we have some certainty it continues in the present
An activity that started in the past and we know how long it has lasted
An incomplete activity
A recurrent activity within a certain period of time
An activity that started in the past and we know when it started
