Example:
- I went to the cinema last Friday.
- Leonardo painted the Mona Lisa.
The auxiliary verb is: 'did'.

Exercises:
- Regular and irregular verbs
http://www.englishleap.com/exercises/regular-and-irregular-verbs-1
- Pronunciation of regular verbs
http://www.perfect-english-grammar.com/how-to-pronounce-ed.html
- Past Simple exercises
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_mix.htm
https://www.ego4u.com/en/cram-up/grammar/simple-past/exercises
http://www.myenglishpages.com/site_php_files/grammar-exercise-simple-past.php
http://web2.uvcs.uvic.ca/elc/studyzone/200/reading/smicat1.htm
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