How to add the ending "-ly" to words

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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