SECOND LEVEL
QUANTIFIERS
BASE OR -ING FORM
http://suz.digitaleschulebayern.de/english/grammar/present_gerund1.htm
QUESTIONS IN THE PRESENT TENSE
WAS WERE
PAST SIMPLE
http://www2.arnes.si/~oskplucija4/ces/verbs3.htm
http://personales.ya.com/mjandres/archivos/pastsimple1.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=2325
http://www.englishexercises.org/makeagame/viewgame.asp?id=5147
http://www.isabelperez.com/happy/tenses/exercises/past_end.htm
http://www.english-grammar-lessons.com/pastsimple/exercise3.swf
ED SOUNDS
http://www.englishmaven.org/Pages/Pronouncing%20ED%20Endings.htm
https://www.englisch-hilfen.de/en/exercises/pronunciation1/index.php
https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-2578.php
PAST CONTINUOUS VS PAST SIMPLE
MUST - HAVE TO - RULES - CHORES