The operability of this new software is very excellent.

The operator is operating the machine.

He opposed the plan.

The dialogue with him is always fun.

This area has active convection, causing frequent thunderstorms.

They were put in a situation of confrontation.

He is studying about Einstein's theory of relativity.

He is good at writing antithetical couplets.

This is absolutely without a doubt.

This object is the focus of my research.