He rejoiced when he heard about the success.

Kei's birthday party was filled with everyone's jubilation.

Kinshi is my best friend.

His words can be understood as a metaphor.

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.