There are eight diphthongs in English and one of them is very uncommon.
Diphthongs
| Sound |
Key word |
Most usual spelling |
| eɪ |
Train |
a, ai, ay, |
| əʊ |
Phone |
o, oa |
| aɪ |
Bike |
i, y, igh |
| aʊ |
Owl |
ou, ow |
| ɔɪ |
Boy |
oi, oy |
| ɪə |
Ear |
eer, ere, ear |
| eə |
Chair |
air, are |
| ʊə |
Tourist |
A very uncommon sound |