MODALS

http://www.english-zone.com/verbs/can-cant.html (can/can’t/could/couldn’t) http://english-zone.com/verbs/haveto1.html (have to/don’t have to) http://www.better-english.com/grammar/should1.htm (should) http://www.ego4u.com/en/cram-up/grammar/auxiliary-verbs/exercises (vari) http://www.ego4u.com/en/cram-up/grammar/auxiliary-verbs/exercises?02 (vari) http://www.english-4u.de/modal_verbs_ex1.htm (vari) http://www.english-4u.de/modal_verbs_ex2.htm (vari) http://www.english-4u.de/modal_verbs_ex3.htm (present, past, future) http://www.english-4u.de/modal_verbs_ex4.htm (present, past, future) http://www.better-english.com/grammar/neednthave.htm (needn’t have) http://www.eslcafe.com/quiz/modal1.html (vari) http://www.eslcafe.com/quiz/modal2.html (modali composti)