make or do

http://imparareinglese.com/esercizi_inglese/makeordo.html

http://imparareinglese.com/esercizi_inglese/makeordo2.html

http://www.vocabulary.cl/Games/Do_Make.htm

http://learningapps.org/192576

http://www.englisch-hilfen.de/en/exercises/confusing_words/make_do2.htm

present prefect

http://www.montsemorales.com/gramatica/PresPerf1.htm

http://www.learnenglish.de/Games/Tenses/PresPerSim.html

http://first-english.org/english_learning/english_tenses/present_perfect/50_present_perfect_negative.htm

http://www.english-grammar-lessons.com/presentperfect/exercise9.swf

pres perf continuous

http://suz.digitaleschulebayern.de/english/grammar/presperfc1.htm

http://www.adelescorner.org/grammar/pres_per_cont/pres_perfect_cont_neg.html

http://www.ecenglish.com/learnenglish/lessons/present-perfect-continuous

http://www.perfect-english-grammar.com/present-perfect-continuous-exercise-1.html

http://www.englishgrammarsecrets.com/presentperfectcontinuous/exercise3.swf