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
Types of rapist Types of rapist Various researchers have set forth different theories concerning types of rapist. According to Howard Barbaree, a psychologist at Queen's University in Kingston, Ontario, most rapes are impulsive and opportunistic, and committed by people who may commit other impulsive acts, including impulsive crimes. These rapists tend to show no anger except in response to their victim's resistance, and use little unnecessary force. Then there are rapists who are preoccupied with a fixed sexual fantasy, which they try to act out in the rape, such as a fantasy in which they force a victim to have sex, and they