compound adjective

cocoricot posted:

Please tell me which is correct. 

1. They are building a two- kilometer long bridge.
2. They are reading a two-hundred-page comic.

Hello, Coco,

Only (2) is correct. In (1), the hyphen should touch the word that follows it, and there should be another hyphen between "kilometer" and "long"; "two-kilometer" modifies the adjective "long," and the whole sequence modifies "bridge":

(1a) They are building a two-kilometer-long bridge.

If you want to avoid that hyphenated construction, simply use a relative clause:

(1b) They are building a bridge that will be two kilometers long.

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