He did his best to protect his younger brother.

This verb is a godan conjugation.

Following the customs of the time, they celebrated the festival.

During rush hour, the trains are very crowded.

I wake up at seven o'clock every day.

I wake up at six o'clock every day.

Let's meet at the station at five o'clock.

I wake up at eight o'clock every day.

I wake up at nine o'clock every day.

The meeting will start at two o'clock.