PRESENT CONTINUOUS
IT IS USED TO EXPRESS A TEMPORARY ACTIVITY THAT IS IN PROGRESS AT THE MOMENT OF SPEAKING
I am listening to the radio now.
It is raining at the moment.
They are reading. Please, be quiet!
IT IS USED TO DESCRIBE A TEMPORARY ACTIVITY IN PROGRESS THAT OCCURS IN A CERTAIN PERIOD OF TIME (TODAY, THIS WEEK, THIS MONTH, THIS YEAR, THIS TERM)
Martin is trying to lose excess weight this year.
I am writing a letter of application for a university today.
She is staying at her friend's place this week.
IT IS USED TO DESCRIBE AN ACTION THAT IS CHANGING OR DEVELOPING
It is getting dark
The crowd is getting louder
IT IS USED TO EXPRESS ANNOYING HABITS
You are always leaving the doors open.
They are having parties in the middle of the week all the time.