Alkenes play an important role in organic chemistry.

He wore a fedora and looked very stylish.

He bought a new fedora.

The Hachijō bulbul is chirping outside the window.

The wind was so strong that my umbrella was overturned.

They will never remarry after they divorced. Because 'once a married couple divorce, they can't get back together', as the proverb says.

This hamburger is large and delicious.

I often eat muesli for breakfast.

What is that?

He was pretending not to witness her wrongdoing.