Most adjectives that have more than one syllable and end in le simply change the e to y to form the adverb.
Example: favorable – favorably
Instructions: Change the following adjectives to adverbs.
1. noble
2. horrible
3. sensible
4. suitable
5. comfortable
–For answers scroll down.

1. nobly
2. horribly
3. sensibly
4. suitably
5. comfortably

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from Daily Grammar Lessons Blog