Pre-adolescents 3 August 16th

We did units 17 and 18: Present perfect simple
HOMEWORK:
Finish unit 17 (Activity book)
EXTRA PRACTICE:
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises
http://www.englishexercises.org/makeagame/viewgame.asp?id=2705
http://www.englishexercises.org/makeagame/viewgame.asp?id=1394
http://www.englisch-hilfen.de/en/exercises/confusing_words/since_for.htm