What is a dipthong?
WHAT IS A DIPHTHONG?
To put it simply, a diphthong is a sound that is formed when two vowels are combined together to form a single syllable. It is seen as a complex speech sound. When pronouncing diphthongs, the speakers mouth will move to be able to sound them out correctly. To elaborate further - the tongue will move or change position when the diphthong syllable is being sounded out.
The double vowel sound of the diphthong is a single syllable and occurs when two vowels are put side by side.
There are many diphthongs but the most common in the English language are:
oy / oi - boy. toy Roy coin noise
ou / ow - cow bow sow low flower loud sound round
ew - sew
aw / au. - straw law paw haul cause
Here are some videos that put the meaning of a diphthong into child friendly language with some activities.