class 7: since and for

Click the links and do the exercises
http://www.ego4u.de/de/cram-up/vocabulary/since-for
http://www.5minuteenglish.com/apr7.htm
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-3647.php
https://www.englishclub.com/grammar/verbs-m_for-since_quiz.htm
http://a4esl.org/q/h/lb/forsince.html