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Which one of these sentences is grammatically correct?

  • I cooperated with this company on a per-project basis.

  • I cooperated with this company on a project basis.

  • I cooperated with this company on project basis.

1 Answer 1

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The first two sentences are correct. They mean the same thing. The third sentence is incorrect. Per-project is a compound adjective. In sentence 2, project is being used as an adjectival noun or noun adjunct. You can read about noun adjuncts here:

http://grammarist.com/grammar/nouns-as-adjectives/

In both sentence 1 and 2, you need the indefinite article a for the noun basis.

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