Present progressive lesson
http://www.studyspanish.com/lessons/presprog.htm

Present progressive exercise to review understanding of the lesson
http://www.studyspanish.com/practice/presprog.htm

Reviewing Present Progressive step by step

1) Written practice conjugation of regular verbs in the present progressive from the infinitive form
http://academics.vmi.edu/modlan_kbb/hotpotatoesquiz/presprog.htm
2) Written practice conjugation of regular verbs in the present progressive from the present tense form
http://academics.vmi.edu/modlan_kbb/hotpotatoesquiz/morepresprog.htm
3) Written practice conjugation of verbs that stem change in the present progressive from the infinitive form
http://academics.vmi.edu/modlan_kbb/hotpotatoesquiz/doublestem.htm
4) Matching exercises of regular and stem changing verbs from present tense to present progressive
http://academics.vmi.edu/modlan_kbb/hotpotatoesquiz/presprogprac.htm
5) Oral exercises of regular and stem changing verbs. Translate present progressive sentences from English to Spanish orally and then click to hear the answer.
http://www.studyspanish.com/lessons/games/presprog-la.htm

6) Written practice of all verbs regular, and stem changing verbs from the infinitive to the present progressive. http://www.colby.edu/~bknelson/exercises/pres_prog.html

7) Written practice of all verbs regular, and stem changing verbs
From present tense to present progressive
http://www.trinity.edu/mstroud/grammar/presprog.htm

http://www.quia.com/quiz/644274.html