He taught him speech regarding whatever had already happened and whatever will happen.
He taught them how to distinguish.
and taught him its pronunciation
He created man
He taught/instructed him the evidence/logic
The One Who gave the gift of speech to man
Has taught him the knowledge of the past and the future
And taught him plain speech
He alone taught him the art of expression and communication (i.e., taught the True Messenger ma kana wa ma yakun).
And taught him (the art of) intelligent and distinct speech
He taught him eloquent speech