He was unconsciously humming the tune.

He is too self-conscious, so he has difficulty speaking in public.

He is too self-conscious, making it difficult for him to accept others' opinions.

We have a strong sense of camaraderie.

He is an expert in ethology, and his research is highly regarded worldwide.

He starts talking about himself at every opportunity, causing trouble for the people around him.

He likes to take a walk in the park at dusk.

He accidentally held her hand.

He is a person of strong vanity who reads self-improvement books.

When she said thank you, I replied you're welcome.