In vowel sounds, the dominant feature of Cockney is its use of diphthongs in words which in standard English are pronounced with monothongs where standard English uses diphthongs.
i:
Cockney employs a diphthongs formed by a slight glide vowel.
| me | see | tree | speak | seize |
u: = əu
u: uses the schwa before the vowel
| few | soon | lose | due | crew | jewel |
ɑ: (ah)
Use of the last back vowel as in “ask” is the same as R.P.
| laugh | can’t | draft | ask | mask |
ei = æi
| may | game | train | fame | take |
ai= ɔɪ̌
| time | fine | sign | blimey | might |
ou = au
| go | row | hope | home | know |
au
au is spread and nasalized.
| how | crown | house | about | lout |