This document discusses different types of sounds in English: diphthongs, syllabic consonants, and plosives. It defines diphthongs as combinations of two vowels in one syllable, like "ai" and "ou". It notes common diphthongs Indonesian speakers mispronounce. Syllabic consonants are consonant sounds that function as a vowel nucleus, such as "l" and "n" in words like "bottle". Plosives are consonant sounds produced by complete closure of the vocal tract followed by release, such as "p", "t", and "k". It provides examples of bilabial, alveolar, and vel