Special education of the republic of uzbekistan

The pre-head includes unstressed and half-stressed syllables preceding the first stressed syllable.

The head includes the stressed and unstressed syllables beginning with the first stressed syllable up to the last stressed syllable.

The last stressed syllable is called the nucleus.

The unstressed and half-stressed syllables that follow the nucleus are called the tail.
It was a very sunny day yesterday.

It was a …. – the pre-head

…'very 'sunny – the head

… ˎday … – the nucleus

…yesterday – the tail
Note:

According to V.D. Arakin, the first unstressed syllable which may contain either unstressed or half-stressed syllables is called the pre-head.

The first stressed syllable up to the last stressed syllable is called either the head or a scale.

As for the last stressed syllable it may either be called the nucleus or a tone.

Graphically these intonation parts can be shown as following:
It was a 'very 'sunny ˎday yesterday.
the head (scale) the tail

_… ¯ ˙ ^─ · _{ …}