the negative forms of "to be"

http://www.eclecticenglish.com/grammar/PresentSimpleToBe1B.html
http://www.englishexercises.org/makeagame/viewgame.asp?id=8213
http://www.englishexercises.org/makeagame/viewgame.asp?id=8301
http://www.englishbee.net/lessons/basic_exer/tobe/to_be_negative/verb_to_be_negative.htm
https://www.montsemorales.com/gramatica/Benegative.htm
http://www.perfect-english-grammar.com/present-simple-exercise-10.html

Use the positive or negative forms of "to be"
http://www.englishmaven.org/HP6/To_Be_Exercise4.htm
http://www.englishmaven.org/HP6/To_Be_Exercise3.htm

class 9: infinitive or gerund? explainity

https://www.youtube.com/watch?v=h-nI0d94WjM

class 6: will-future explainity

https://www.youtube.com/watch?v=f_i21LirbAg

class 6: the past progressive

In these exercises use the past progressive only.
http://www.ego4u.de/de/cram-up/grammar/past-progressive/exercises
http://www.ego4u.de/de/cram-up/grammar/past-progressive/exercises?05
http://www.ego4u.de/de/cram-up/grammar/past-progressive/exercises?06
http://online-lernen.levrai.de/englisch/englisch_zeiten/past_progressive/10_past_progressive_signalwoerter.htm
http://www.ego4u.de/de/cram-up/grammar/past-progressive/exercises?07
http://www.myenglishpages.com/site_php_files/grammar-exercise-past-progressive.php
http://www.really-learn-english.com/past-progressive-exercises.html


simple past or past progressive?
http://www.englisch-hilfen.de/uebungen/zeiten/simple_past_progressive.htm
http://www.englisch-hilfen.de/uebungen/zeiten/simple_past_progressive2.htm
http://www.kico4u.de/english/uebungen/7klasse/paprog1.htm
http://english.lingolia.com/de/grammatik/zeiten-gegenueberstellung/simple-past-past-progressive/uebung
http://english.lingolia.com/de/grammatik/zeiten-gegenueberstellung/simple-past-past-progressive/uebung
http://www.pgm.musin.de/llw/Englisch/G8/7/U1/PaPro.htm

class 6: past progressive

https://www.youtube.com/watch?v=3IBII1H7UEo

class 6: present progressive

https://www.youtube.com/watch?v=VRlVcq-_AoQ&feature=youtu.be

class 9: active/passive

https://www.youtube.com/watch?v=UdA_BFX4QiI