Thanks, We don't. Perfect tenses require a past participle. There is no past participle in that phrase.
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Anonymous"I haven't the foggiest" - why do use use the perfect tense in this phrase?Thanks,We don't. Perfect tenses require a past participle. There is no past participle in that phrase. Therefore, it is not a perfect tense. The phrase contains only the present tense of "have".
AnonymousThanks CJ, but why is it "haven't" and not "don't have"?have is the only verb besides be that allows that construction, i.e., an interrogative or negative without do-support.