Phenomenology is a branch of philosophy that focuses on the study of human experience and consciousness.

It's difficult to understand his explanation.

He is an expert in physics.

Part of this movie is based on actual events.

It's difficult to understand his explanation.

My homework is not finished yet.

My homework is still unfinished.

He was helping the villagers as a wizard.

I haven't done my homework yet.

This phenomenon remains unexplained for scientists.