1. CONTRAST BETWEEN SIMPLE PAST AND PAST PERFECT.
EXPLANATION
http://www.englisch-hilfen.de/en/grammar/past_perfect_simple_past_contrasted.htm
EXERCISES
http://www.english-4u.de/past_perfect_ex5.htm
https://www.ego4u.com/en/cram-up/grammar/simpas-pasper/tests?test1
https://www.ego4u.com/en/cram-up/grammar/simpas-pasper/tests?test2
http://www.englisch-hilfen.de/en/exercises/tenses/past_perfect_simple_past.htm
2. CONTRAST BETWEEN SIMPLE PAST PAST CONTINUOUS
EXPLANATION
http://www.englisch-hilfen.de/en/grammar/simple_past_progressive_contrasted.htm
EXERCISES
http://www.perfect-english-grammar.com/past-simple-past-continuous-exercise-1.html
http://www.englishpage.com/verbpage/verbs3.htm
http://www.english-4u.de/past_prog_ex6.htm
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