Vowel whose quality does not change over the duration of the vowel is called a monophthong. Monophthongs are sometimes called "pure" or "stable" vowels. A vowel sound that glides from one quality to another is called a diphthong, and a vowel sound that glides successively through three qualities is a triphthong. All languages have monophthongs and many languages have diphthongs, but triphthongs or vowel sounds with even more target qualities are relatively rare cross-linguistically. English has all three types: the vowel sound in "hit" is a monophthong , the vowel sound in "boy" is in most dialects a diphthong , and
Seven Types of Ambiguity (TV series) Joe and Anna, are frantic. The boy is returned unharmed and the police arrest the mother's ex-boyfriend Simon and then investigate his suspected accomplice Angela, who has a connection to the boy's father. Simon's psychiatrist Dr Alex Klima, his lawyer Gina, and Joe's best mate Mitch are pulled into the entangled relationships and moral dilemmas. Seven Types of Ambiguity (TV series) Seven Types of Ambiguity is an Australian television drama series on the ABC first screened on 13 April 2017. The six-part series is based on "Seven Types of Ambiguity", a 2003 novel by Australian writer Elliot Perlman. The series