They are negative forms of helping verbs for the present perfect and the present tenses. Haven't you eaten in that restaurant before? Don't you eat in that restaurant quite often?
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Huzaifa Asif Both of these sentences you mentioned have same meaning, philip?Not exactly: past action vs present action.
Huzaifa AsifFrom the first sentence, we can imply that you still have vitiligo as you said it extends to present moment?If it extends to the present moment, then I still have it.
Huzaifa AsifWhat do HAVE and HAD imply then if HAVE HAD extends to present moment?'Have had' is the present perfect form of the verb HAVE. The present perfect form always suggests some form of retrospection. The speaker is in the present, and is looking back at the past.