We are going on a trip tomorrow.

He holds a personal grudge against me.

A drop of water fell from the cup.

He is living as a recluse.

Neutron stars are known for their density and strong gravity.

His thesis is filled with a lot of comments.

He commented on the article.

He underwent surgery for appendicitis.

He is the center of the team.

A neutron is part of an atomic nucleus.