English is I-lowering language, but on split IP hypothesis([AgrP [TP [VP]]]), verbs move to the head of TP: V-raising.
/John often kissed Mary./ On unsplit IP(IP[VP]), [+tense] which the head of IP has moves to the head of VP for realization; I-lowering. Whereas on split IP(AgrP[TP[VP]]), [+tense] which the head of TP has is realized by verbs moving to the head of TP; V-raising.
Why, on IP split hypothesis, does V-raising occur in I-lowering language?
And in a sentence which has adverbs like above, after V-raising occurred, the verb is before the adverb; *John kissed often Mary. How is the word order correct before spell-out? I would like to know the movement of subjects and verbs. If you know how is the nominative Case assigned, I'd like to know.