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https://www.grammarbank.com/since-vs-for-exercises.html

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http://esl.fis.edu/grammar/multi/adj1.htm

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https://www.english-in-chester.co.uk/e-learning/lesson/superlatives-comparatives/

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https://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adjectives/exercises?02

https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-113196.php

https://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-62912.php

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http://baladre.info/english/sedaviwebfront/pastsimpcont7.htm

https://www.montsemorales.com/gramatica/PastSimpContSw2-6-3.htm

https://www.englisch-hilfen.de/en/exercises/tenses/simple_past_progressive.htm

https://elt.oup.com/student/project3rdedition/level5/unit1/grammar/exercise1?cc=global&selLanguage=en

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https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/tests?test3

https://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex11

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