Monopthongs is also calls pure vowel which are divided into two (2) segment, i.e seven short vowels and five long ones. E.g I:, I,e, e, ae, a: ,d , c: u, u: , u, , c:, a,
Diphtongs – This is a double sound, The diphthongs are vowels but they differs from the pure vowels because their articulation involves glides from one vowel quality to the other. A diphthong is therefore, a vowel which changes its quality in the process of its articulation. If you far instance the word “toy” the articulation of the diphthong in the word star with / / and end with /I /.
There are eight diphthongs in English and their phonetic symbols indicate the initial and final vowels represented in the articulation. E.g /ei/, / /, / /, / /, / /, / /, / /.
/ei/ as in pay , again
/ / as in home, go, so
/ / as in rice , kite,
/ / as in cow, house.
/ / as in toy, rice
/ / as in ear , here
/ / as in air, hair
/ / as in poor, tour.
See also