Nasals are produced by making a complete closure in the mouth (as for plosives). They are different from plosives in that the soft palate is lowered and the air is allowed to pass through the nasal passage.Since the air escapes through the nose, nasals can be continued, whereas plosives cannot. In this respect, they are like fricatives, though there is no audible friction as there is in the case of fricatives. They are, in other words, vowel-like. All the three nasals in English are voiced. There are three types of nasals:Bilabial nasal: For the articulation of /m/ we make a complete closure at the lips. The soft palate is lowered to allow a free passage of air through the nose. Alveolar nasal: For the production of \n/ we make a closure in the mouth between the tip of the tongue and the alveolar ridge, and the rims of the tongue and the upper side teeth. The soft palate is lowered and the air passes out through the nose without any obstruction. Velar nasal: To articulate \ng/ we make a complete closure between the back of the tongue and the soft palate. The soft palate is lowered to allow the air to pass freely through the nose. From the above-mentioned information, we can conclude that 'there are four nasals in English' is an incorrect statement as there are four types of nasals.Hint Phonology is concerned with how a particular language organizes its sounds into distinct units (called phonemes), and how the phonemes are combined into .syllables. and how the prosodic features of lengths, stress, and pitch are organized into patterns. The diphthong is an impure vowel, it is a two vowel sound that cannot be split. A diphthong is a sound formed by the combination of two vowels in a single syllable, in which the sound begins at one vowel and moves towards another (as in coin, loud, and side).Vowel sound: In vowel sounds, the airflow is unobstructed when the sound is made. For example, vowel sounds are the music or movement of our language. There are 5 vowels which produce 20 sounds.