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Adverbien vertailusta vielä tässä: https://kielenoppi.wordpress.com/category/adverbit/

Harjoituksia:

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

http://www.learnenglishfeelgood.com/english-adverbs-comparative1.html

http://www.englisch-hilfen.de/en/exercises/adjectives_adverbs/adverb_comparison.htm