Diphthongs

English Origin
aa [ɑː] [a:] or [ä] father
uu [uː]  food

ii [iː]  feet

aï [aɪ] eye

eï [eɪ] late

oï [ɔɪ] boy
iä [ɪə] here
uä [ʊə] sure
ou [oʊ] go
au [aʊ] now
eä [ɛə] bear

oo[ɔː] bought

ä [ə] can also be pronounced as an a [a]

Other

ai [ai] hay

au [au] pausa

ei [ei] rey

eu [eu] pseudo

oi [oi] hoy

ou [ou] bou

ua [wa] guardar

ue [we] [ue] suegro
ui [wi] fuimos

uo [wo] cuota

ia [ja] fiarse
ie [je] fiera

io [jo] yo

iu [ju] ciudad