1. The Present Simple
http://perso.wanadoo.es/autoenglish/gr.presim.i.htm
2. The Present Progressive
http://perso.wanadoo.es/autoenglish/gr.prescon2.i.htm
3. The Past Simple
http://perso.wanadoo.es/autoenglish/gr.pastsim.i.htm
4. The Present Perfect
http://perso.wanadoo.es/autoenglish/gr.since.i.htm
5. The Future Simple
http://www.ego4u.com/en/cram-up/grammar/future-1-will/exercises
6. The Past Progressive