Elements in an intonation unit The nucleus: the stressed syllable of the last 调核 prominent word in a tone unit The tail: any syllable or syllables that may 调尾 follow the nucleus The head: the part of a tone unit that extends from 调头 the first stressed syllable up to the nucleus The pre-head: any unstressed syllable or syllables that 调冠 may precede the head -or the nucleus if there is no head4 ◼ Elements in an intonation unit ◼ The nucleus: the stressed syllable of the last 调核 prominent word in a tone unit ◼ The tail: any syllable or syllables that may 调尾 follow the nucleus ◼ The head: the part of a tone unit that extends from 调头 the first stressed syllable up to the nucleus ◼ The pre-head: any unstressed syllable or syllables that 调冠 may precede the head - or the nucleus, if there is no head