Here are the sites that I would like to use. 

Future

http://www.collegeem.qc.ca/cemdept/anglais/goingto.htm

http://www.better-english.com/grammar/goingto1.htm

http://www.better-english.com/grammar/goingto2.htm

http://www.better-english.com/grammar/presfut.htm

Modals

http://www.collegeem.qc.ca/cemdept/anglais/musthavt.htm

http://www.better-english.com/grammar/can3.htm

http://www.better-english.com/grammar/could2.htm

http://www.better-english.com/grammar/should2.htm

General Review

http://www.englishlearner.com/online/grint4.html

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

http://www.englishlearner.com/maze.html