He was watching TV all day.

He is looking outside from the window now.

She saw a distant mountain.

His explanation was impossible to understand.

It's not so much a big problem.

Oh, that's right, I remembered what I ate for dinner yesterday.

In this experiment, you can observe a chemical reaction.

This substance undergoes a chemical change when heat is applied.

Japanese is a language with few declensions.

The existence of dark matter has not yet been fully proven.