http://suz.digitaleschulebayern.de/english/grammar/was_were1.htm
http://www.agendaweb.org/verbs/tobe-past-simple/index.html
https://www.ego4u.com/en/cram-up/grammar/simple-past/exercises?03
http://www.carmenlu.com/first/grammar/pastbe1_3.htm
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