Ar-Rahman Verse 4

˹and˺ taught them speech.

and taught him speech.

and He has taught him the Explanation.

and taught him to communicate.

He taught distinctness.

He has taught him speech (and intelligence).

and has taught him articulate speech.

And taught him to express clearly.

Has taught him the knowledge of the past and the future.

[and] taught him articulate speech.

He has taught him speech.

And taught him (the art of) intelligent and distinct speech.

He taught/instructed him the evidence/logic

Has taught him the knowledge of the past and the future.

Taught him speech (language, modes of expression and communication)

He taught him eloquent speech.

Taught the Qur’an.

Taught him the mode of expression.

He hath taught him utterance.

and has taught him intelligible speech.

and taught him its pronunciation.

He taught him Al-Bayan.

and He taught him speech.

And taught him clear expression.

teaching him the [coherent] speech, utterance.

Ar-Rahman!

He has taught the Qur'an.

He created man.

He taught him Al-Bayan.

Al-Hasan said;"Eloquent speech."

This refers to Allah teaching the Qur'an, that is, teaching the servants how to recite it by making it easy for them to speak and pronounce letters with the various parts of the mouth, such as the alveolar bridge, the tongue and the lips
Among Allah's Signs;the Sun, the Moon, the Sky and the Earth

Allah said,

الشَّمْسُ وَالْقَمَرُ بِحُسْبَانٍ

And He taught him the expression of his thoughts in words and intellectual acquaintance with, and perception of, fact and truth and good versus evil