Suddenly, it started to rain.

He suddenly stood up.

It started raining all of a sudden.

The train suddenly stopped.

The train stopped at the station.

I commute by train every day.

That disease is caused by a mutation.

I commute using a train that stops at every station.

It's a five-minute walk from my house to the nearest railway station.

It's a five-minute walk from my house to the nearest railway station.