Task 1
Revision of SINCE and FOR
http://a4esl.org/q/h/9704/bd-for-since.html
http://a4esl.org/q/h/9807/km-sincefor.html
http://a4esl.org/q/h/lb/forsince.html
http://www.angelfire.com/wi3/englishcorner/grammar/Interactive/sincefor.html
http://www.esltower.com/GRAMMARQUIZ/intermediate/for%20or%20since.htm