The correct sentence is:
He is reluctant to speak in public.
Because of his reluctance to speak about himself, he remained quite enigmatic to people around him. Archaeologists learned little about the enigmatic predecessors of the Olmecs.
Speak! Good dog!
the adjective is good.
yes you can but only in good sense
The volcano is erupting as we speak.
Prisonners are exiles of the public.
"Did you have a chance to speak with him?" is a perfectly good and correct sentence. It does not contain any grammar mistakes.
A town park where the children can play has been established for the public good. The definition of a public good is a good or service that is provided for the public collectively without profit.
one public policy in ever state is that there is no weed allowed......
I would like to speak with the superintendent, please.
The public institutions are becoming very long.
Candidates use the media to get their message to the public.