Basic Guidelines For English Spellings
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The ending -ly is often added to adjectives and nouns to form adverbs and adjectives, for example:
slow, slowly
week, weekly
endless, endlessly
If you're adding -ly to an adjective that ends in a single consonant plus-le, then you need to drop the -e and just add a -y:
gentle, gently
single, singly
terrible, terribly
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