WHOLE CHARACTER
句jù, gōu
sentence; a measure word for phrases; (句读) pauses in classical texts
句 is a sentence: 句子 'sentence', 造句 'to make a sentence', 句号 'full stop'.
ZDIC header: 象形; the detailed source treats 句 as 形声,从口 and ties the old reading gōu to 钩/勾 'hook' — the bending-wrap origin. The modern shape wraps 口 in the 勹 frame.
OUTER FRAME: THE WRAP PIECE
勹
Notice this part of the shape; it is not taught as a separate word in this lesson.
In 句: outer frame: the wrap piece A bound wrapping form; shown as a written piece only.
INNER: THE MOUTH PIECE (ZDIC DETAILED ACCOUNT: 从口)
口kǒu
mouth; opening
Mouth/speech/opening clue; may also be a repeated visual element.
In 句: inner: the mouth piece (ZDIC detailed account: 从口) Shown with its documented or clearly limited role.