English Tenses
23. 3. 2016
https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex08
https://www.ego4u.com/en/cram-up/grammar/simpas-preper/exercises?ex07
http://www.englishtenses.com/exercise/past_continuous_and_simple
Past perfect:
http://first-english.org/english_learning/english_tenses/past_perfect/04_past_perfect_use.htm
http://www.englishtenses.com/test/past_perfect_or_past_simple