Grammar & Punctuation – adverb formation – English editing.

Many ADJECTIVE can be transformed into ADVERB by the addition of the SUFFIX -ly.
Rules:
 The base rule is that you add -ly to the adjective:
sad = sadly
 If the adjective ends in -ll, just add -y:
full = fully
 Most adjectives of one syllable that end in -y are regular, with the exception of gay = gaily
 For two-syllable adjectives that end in -y, replace the final -y with the letters -ily:
happy = happily
 Adjectives that end with a consonant followed by -le, replace the final -e with -y:
terrible = terribly
 Adjectives that end in -ly cannot be transformed by adding -ly, instead, use a short phrase:
friendly = in a friendly way
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