Style and grammar

Adverbs of manner are usually placed after the main verb, thus: he translated the article single-handedly; he ran fast; she told her story calmly. However it is possible to place the adverb before the verb. This places emphasis on the adverb: she calmly announced that she had fallen in love with someone else; she quickly finished her dinner.

However if you place this particular adverb after the verb, remove the final -ly: he translated the article single-handed.

Garner's Modern English Usage, by Bryan Garner (2016)



Note that some adverbs are always placed after the verb: well, badly, hard, fast.

Thank you very much, Centrox! As always, an exhaustive answer.