Using the Present Continuous Tense
We most often use the Present Continuous when we talk about something which is happening at the time of speaking (now, at the moment):
Examples: Pamela is sleeping in the bedroom.
Present Continuous is also used when we talk about something which is happening at present, but not necessarily at the moment of speaking:
Examples: 1. I'm reading an interesting book.
We can use the Present Continuous when we talk about temporary actions taking place only for a period of time (today, this week, this semester, this year):
Examples: 1. My husband is working hard today.
Present Continuous is also used to express current trends:
Examples: 1. Fuel prices are rising constantly because of strong demand.
We can use the Present Continuous when we talk about repeated actions which are irritating to the speaker (always, constantly):
Examples: 1. He is always complaining from his colleagues.
Sometimes we use the Present Continuous to describe a planned action in the near future:
Examples: 1. I'm leaving for Vienna tomorrow morning.
EXERCISES
http://www.aulafacil.com/CursoIngles/Ejercicios7.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=3438