since-for

http://www.agendaweb.org/grammar/for_since_already-exercises.html

since-for

http://www.usingenglish.com/quizzes/235.html

http://www.learnenglish-online.com/grammar/tests/forsince.html

http://www.angelfire.com/on/topfen/testsforsince1.html

http://www.impact-english.com/members/Grammar_Practice/Always/test-grammar/gr_prac_S-F-gen.htm



http://www.eslgamesworld.com/members/games/grammar/perfectpast/spin%20wheel%20present%20past%20tenses.html
http://www.eslgamesplus.com/fun-games/