He was thinking of a catchphrase to come up with something he wanted to say.

They were having fun chatting at the party.

I had a good time having fun talking with my friends.

He has the ability to speak multiple languages.

'Ise Monogatari' is one of the classical literatures, a story themed on love.

He likes to speak using conventional phrases.

She overcame speech production disorder after brain damage.

He has retained his ability to produce speech even after brain damage.

Derivative is one of the important concepts in linguistics.

He explained using simple words.