‘Monthly’ and ‘annual’ as descriptors

When I am describing a service that is billed for once a month I write, “This is a monthly service.” When describing a service that is billed for once a year I use, “This is an annual service.”

Why would using “This is an annually service.” sound incorrect? It’s as if ‘monthly service’ is used as shorthand for ‘monthly billed service’, and ‘annual service’ is used as shorthand for ‘annually billed service’. Is my problem that ‘monthly’ is used incorrectly in the first case?

Answer

An annually service sounds wrong because it is wrong; you’re using an adverb where you need an adjective (annual).

The trick is that the adjective form of “once a month”, monthly, just happens to be the same as the adverbial form, monthly; the reader automatically assigns the word to its correct role based on its placement in the sentence.

Attribution
Source : Link , Question Author : Sean Fahey , Answer Author : Hellion

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