Suddenly, a loud noise came from the next room.（突然，隔壁房间传来一声巨响。）

She was walking in the park when suddenly it started to rain.（她正在公园里散步，突然下起雨来。）

The lights suddenly went out and everyone was in the dark.（灯突然熄灭了，所有人都陷入了黑暗中。）

He was talking on the phone when suddenly he heard a strange sound.（他正在打电话，突然听到一个奇怪的声音。）

Suddenly, a beautiful bird flew across the sky.（突然，一只美丽的鸟飞过天空。）

The baby was sleeping peacefully, but suddenly woke up crying.（宝宝原本睡得很安稳，但突然醒来大哭起来。）

They were having a picnic when suddenly a dog ran towards them.（他们正在野餐，突然一只狗朝他们跑过来。）

I was reading a book when suddenly someone knocked on the door.（我正在看书，突然有人敲门。）

Suddenly, the car in front of us stopped abruptly.（突然，我们前面的车急刹车停了下来。）

She was dancing happily when suddenly she tripped and fell.（她正开心地跳舞，突然绊倒了。）

The music was playing softly, then suddenly it got very loud.（音乐原本轻柔地播放着，然后突然变得非常大声。）

He was running fast when suddenly he twisted his ankle.（他正快速奔跑着，突然扭伤了脚踝。）

Suddenly, a bright flash of lightning lit up the sky.（突然，一道明亮的闪电照亮了天空。）

They were chatting when suddenly an argument broke out.（他们正在聊天，突然爆发了一场争吵。）

I was waiting for the bus when suddenly I remembered I left my keys at home.（我正在等公交车，突然想起我把钥匙落在家里了。）

The sun was shining brightly, but suddenly clouds covered it.（阳光原本灿烂地照耀着，但突然乌云遮住了它。）

She was writing a letter when suddenly her pen ran out of ink.（她正在写信，突然她的笔没墨水了。）

Suddenly, a gust of wind blew the papers all over the place.（突然，一阵风把文件吹得到处都是。）

He was watching TV when suddenly there was a power cut.（他正在看电视，突然停电了。）

The children were playing games when suddenly it was time to go home.（孩子们正在玩游戏，突然到了该回家的时间。

）