1) Tonology

Grammatical Tone

Tone Sandhi 

Unstressed Tone (TUS; i.e., neutral tone/T0)

2) Syllable Structure

Syllable Contraction

Hiatus context (Vowel competition)

Pre-nucleus glide

Moraic structure

3) Prosodic Structure

Syntax-phonology mapping

Metrical Theory

1) Syntax-PF interfaces

Copy theory (Copy Deletion, Preservation, Pronounced Low Copy) 

Syntax-prosody mapping

Cyclic Spell-out

2) Left Peripheries: Information Structure & CP Layer 

Sentence Final Particle (SFP)

A-bar dependency (Topic, Focus)

Wh-movement

Left/Right Dislocation

3) Nominal Domain

Numeral & Classifier

Plural Marker

Nominal Quantification

4) Coordination

Conjunction & Adjunction

5) Other

Tense, Aspect, Modality

Question Type

Igbo  (2024~)  [wiki] 

Documented dialect: Standard Igbo, Idemili Igbo

Southern Min & Taiwanese (2020~) [wiki] [wiki]

Speakers are sharply decreasing.

Documented Dialects: Chang & Quang