Extra exercises online:
click here to do Exercise 1 on esl.fis.edu
click here to do Exercise 2 on englisch-hilfen.de
Here some extra exercises to revise Present tenses.
1) PRESENT SIMPLE to talk about facts and habits
2) PRESENT CONTINUOUS to talk about situations in progres
3) PRESENT PERFECT SIMPLE to talk about a situation which started in the past and which continue up to the present