Surprised by the sudden heavy rain, I forgot my umbrella.

I was taken aback by his sudden proposal.

Lo and behold, he passed the exam.

I was really astonished by his sudden proposal.

It started raining all of a sudden.

Suddenly, it started to rain.

He suddenly stood up.

I forgot my homework.

Kyoto has a sister city relationship with Boston.

I was fascinated by the beautiful melody of Shimauta, the traditional folk song of Amami.