Adjectives and adverbs and comparisons
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Grammar adjectives adverbs comparisons prepositions
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Extra oefeningen:

https://www.englisch-hilfen.de/en/exercises_list/adjektiv_adverb.htm

https://www.perfect-english-grammar.com/adverbs-or-adjectives-exercise-1.html

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