On this page you will find a number of helpful grammar exercise links:

1    Verb tense exercises

    a   all tenses (and more):

http://www.englishpage.com/verbpage/verbtenseintro.html

http://www.englishlearner.com/tests/test.html

http://www.englishclub.com/ (homepage, all EFL activities)

http://a4esl.org/q/h/grammar.html (verbs and much more...)

http://www.englishforum.com/00/interactive/ (many EFL activities)

    b   Modal Verbs:

http://www.englishpage.com/modals/can.html  (can)

http://www.englishpage.com/modals/modalintro.html  (turorial all M-Verbs)

http://depts.gallaudet.edu/englishworks/grammar/modals.html  (turorial all M-Verbs)

http://www.learnenglish.org.uk/grammar/archive/modal_verbs01.html  (tutorial with links to exercises)

http://esl.about.com/library/grammar/blcanbeable.htm  (can - be able to)

http://esl.about.com/library/quiz/blgrquiz_canbeable.htm  (can - be able to quiz)

http://esl.about.com/library/grammar/blmodalprob.htm  (probability)

http://www.eduhi.at/eduhi/eduhifull.php?url=../eduhi/kategorien.php?kthid=3987  (various exercises)

http://www.geocities.com/ericsquire/grammar/modals2.htm  (various exercises)