psychological

articulatory

acoustic

functional

aspiration

lip position

voicing

degree of muscular tension

the speech used in writing

speech flow with coarticulation and reductions

speech without rhythm

speech in isolation

speech is a physical realization of language

language depends on hearing organs

speech is written and language is spoken

speech and language are identical phenomena

[ə]

[ʊ]

[iː]

[ɔː]

topic and comment

tense and aspect

stressed and unstressed

prefix and suffix

It helps to differentiate statements, questions, and commands.

It shows grammatical relations within a sentence.

It influences spelling.

It expresses emotional colouring.