Rising intonation is used in polite requests.

Triphthongs are gliding vowel sounds made up of two vowel qualities.

Good pronunciation helps to develop native-like accent.

Many post-alveolar consonants are not sibilants.

The soft palate  is velum.

The phonation of a consonant is how the vocal cords vibrate.

Vowel height refers to the horizontal position of either the tongue or the jaw relative to the roof of the mouth.

There are five main patterns in English intonation.

The phoneme is defined as the smallest unit that discerns meaning between sounds.

The phoneme is an abstract categorization of phones.