4. For and Since

http://www.bnv-bamberg.de/home/ba4613/flg/englischinteraktiv/since-for-01.htm

3. For and Since

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

2. For and Since

http://www.englishclub.com/grammar/verbs-m_for-since_quiz.htm

For or Since

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/upperf1.htm

Second Conditional

4.http://www.english-grammar-lessons.com/secondconditional/exercise1.swf
5.http://www.english-grammar-lessons.com/secondconditional/exercise2.swf
6.http://www.english-grammar-lessons.com/secondconditional/exercise3.swf
7.http://www.english-grammar-lessons.com/secondconditional/exercise4.swf

Second conditional

1. http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/2cond.htm
2. http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/2cond.htm
3. http://www.learn4good.com/languages/evrd_grammar/2ndconditional.php3

Modals

1. http://a4esl.org/q/h/0101/ig-modals.html
2. http://www.eslus.com/LESSONS/GRAMMAR/MODALS/Modala.htm
3. http://www.eslus.com/LESSONS/GRAMMAR/MODALS/Gramb.htm
4. http://www.eslcafe.com/quiz/modal1.html
5. http://grammar.ccc.commnet.edu/grammar/cgi-shl/quiz.pl/modal_quiz.htm

first conditional

1. http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/1cond1.htm
2. http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/1cond2.htm
3.http://www.better-english.com/grammar/firstconditional1.htm
4.http://www.learn4good.com/languages/evrd_grammar/1stconditional.htm
5.http://www.oup.com/elt/global/products/headway/preintermediate/a_grammar/unit09/hwy_preint_unit09_2/
6.http://autoenglish.en.wanadoo.es/gr.con1.1.i.htm
7.http://usuarios.lycos.es/madosanchez72/ejercicios3eso/grammar_first_conditional/01.first.htm
8.http://usuarios.lycos.es/madosanchez72/ejercicios3eso/grammar_first_conditional/01.first.htm
9. http://www.english-grammar-lessons.com/firstconditional/exercise2.swf
10. http://www.english-grammar-lessons.com/firstconditional/exercise3.swf
11.http://www.english-grammar-lessons.com/firstconditional/exercise5.swf