Nope, "principal" is the adjective meaning "primary" or "foremost." "Principle" is a noun for a fundamental law or basic belief.
Da' is also third person singular present indicative: http://italian.about.com/library/verb/blverb_dare.htm
Why is "He gives two prime examples." marked as wrong? Is there another meaning for the word and only primary can be used here?
Would this also mean "two basic examples"? "Principal examples" implies the simplest examples
actually the correct translation is principal but the grammatical usage is not correct. there cannot be two principals but there could be two principles