His house has a very modern design.

His secondary role greatly contributed to the success of the team.

Special relativity is one of the fundamental theories of physics.

General relativity is a theory of physics proposed by Einstein.

Thinking sensibly, that plan will not succeed.

This is a preliminary plan.

He is interested in diachronic linguistics studies.

He is interested in synchronic linguistics.

That theory is unscientific and has no evidence at all.

He accidentally held her hand.