https://learnenglishteens.britishcouncil.org/grammar-vocabulary/grammar-videos/some-any-every-and-no
https://www.englishclub.com/grammar/pronouns-indefinite.htm
http://www.bbc.co.uk/worldservice/learningenglish/flatmates/episode71/languagepoint.shtml
http://www.edufind.com/english-grammar/indefinite-and-incomplete-quantities/
http://www.edufind.com/english-grammar/indefinite-pronouns/
http://www.agendaweb.org/grammar/anything-someone-exercises.html
http://www.ecenglish.com/learnenglish/lessons/using-too-and-not-something-enough
https://www.englishclub.com/grammar/pronouns-indefinite.htm
http://www.bbc.co.uk/worldservice/learningenglish/flatmates/episode71/languagepoint.shtml
http://www.edufind.com/english-grammar/indefinite-and-incomplete-quantities/
http://www.edufind.com/english-grammar/indefinite-pronouns/
http://www.agendaweb.org/grammar/anything-someone-exercises.html
http://www.ecenglish.com/learnenglish/lessons/using-too-and-not-something-enough
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