Click on the links below to practice Expressing Future in Time Clauses using before, when, after, as soon as,  and while.
http://www.english-test.net/esl/learn/english/grammar/ii142/esl-test.php

http://www.buowl.boun.edu.tr/students/grammar/beg/begfut2.htm

http://www.e-grammar.org/time-clauses/test1-exercise1/

http://www.e-grammar.org/time-clauses/test1-exercise2/

http://www.e-grammar.org/time-clauses/test2-exercise1/