will (future)

http://members.iinet.net.au/~adelegc/grammar/will/will_neg.html

will (future)

http://www.ego4u.de/de/cram-up/grammar/future-1-will/exercises

will (future)

http://members.iinet.net.au/~adelegc/grammar/will/will.html

going to: future

http://www.englisch-hilfen.de/en/exercises/tenses/going_to_future_negation.htm

was/were

http://www.oup.com/elt/global/products/englishfile/elementary/a_grammar/file05/grammar05_a01/

was/were

http://www.carmenlu.com/first/grammar/pastbe1_5.htm

was/were

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-2570.php

was/were

http://www.oup.com/elt/global/products/headway/beginner/a_grammar/grammarunit09/hwy_begin_unit09_1/

was/were

http://www.tolearnenglish.com/exercises/exercise-english-1/exercise-english-578.php

was were

http://www.tolearnenglish.com/exercises/exercise-english-1/exercise-english-578.php

was/were

http://www.usingenglish.com/quizzes/77.html