British Council: http://learnenglishteens.britishcouncil.org/grammar-vocabulary/grammar-videos/future-forms
Frankfurt International School: http://esl.fis.edu/grammar/rules/future.htm
On-line exercises:
University of Victoria: http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/fut1.htm
Lingolia language school: https://english.lingolia.com/en/grammar/tenses-comparison/future-tenses/exercises
Free practice tests: http://www.examenglish.com/grammar/going_to_will_prediction.htm
Englishpage.com: http://www.englishpage.com/verbpage/verbs18.htm
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