DIPHTHONGS AND TRIPHTHONGS

2. DIPHTHONG:

A complex speech sound or glide that begins with one vowel and gradually changes to another vowel within the same syllable, as (oi) in boil or  in fine.

PROPER DIPHTHONG:

A vowel digraph; a union of two vowels in the same syllable, only one of them being sounded; as, ai in rain, eo in people; called an improper diphthong.

IMPROPER DIPHTHONG:

A vowel digraph; a union of two vowels in the same syllable, only one of them being sounded; as, ai in
rain, eo in people; -- called an improper diphthong.

TRIPHTHONG:

is a monosyllabic vowel combination involving a quick but smooth movement of the articulator from one vowel quality to another that passes over a third. While "pure" vowels, or monophthongs, are said to have one target articulator position, diphthongs have two, and triphthongs three.

3.

PROPER DIPHTHONG	IMPROPER DIPHTHONG	TRIPHTHONG	WORDS THAT ARE NOT DIPHTHONGS OR TRIPHTHONGS
LIGHT	MOON	EMPLOYER	SUN
STAY	CHAIR	LAYER	SEE
MOUNTAIN	PEOPLE	TYRE	READ
POINT	COOK	SOYA	MUSIC
MOUSE	RAIN	PLAYER	RICH
OWL	STOOD	BEAUTY	FLAG
COW	NEAR	SHOWER	WATCH
BOY	SOAP	LOWER	DRESS
MOUTH	GOOD	POWER	PIG
OIL	MEET	LIAR	KING

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4. In this class I could undestand that according to how you write the words, you can qualify  it, if you undestand its meaning you can at the same time improve the pronunciation.