IS

is strong form BrE AmE ɪz , weak forms z, s —After a word ending in s, z, ʃ, ʒ, tʃ, dʒ there is no distinct weak form in Received Pronunciation, though in some varieties §əz is used. Otherwise, the contracted form s may be used after a word ending in p, t, k, f, θ , while z may be used after one ending in a vowel sound or b, d, ɡ, v, ð, m, n, ŋ, l and American English r ; s and z may be shown in orthography as 's. No contraction is possible when this word is stranded: is is always strong and uncontracted in Tell me what it is.