have strong form BrE AmE hæv , weak forms həv, əv, v —The weak form v is used only after a vowel (when it is often written as the contraction 've ), or in very fast speech at the beginning of a sentence; əv is not used at the beginning of a sentence. Weak forms of have, has, had are used only when the word functions as the perfective auxiliary, or is the equivalent of have got and is used with an object that is not a pronoun, or in the constructions had better/best/rather.
▷ had hæd (see)
▷ hadn't ˈhæd ə nt
▷ has hæz (see)
▷ hasn't ˈhæz ə nt
▷ haven't ˈhæv ə nt
▷ haves hævz
▷ having ˈhæv ɪŋ