副詞用法可以放在動詞前面，如例句：「She suddenly stood up and left the room.（她突然站起來，離開房間。）」。也可以放在句首強調「突然」這兩個字，如例句：「Suddenly, he realized he had left his wallet at home.（他突然發現他把錢包忘在家裡。）」。
Please use safety devices for sudden impacts.
遇到突發撞擊時，請使用安全設備。
The bus was delayed due to sudden heavy rain.
突如期來的大雨導致公車延誤。
The sudden appearance of a deer on the road caused the driver to swerve to avoid a collision.
一隻鹿突然出現在路上，逼得駕駛只能急轉方向盤以避開撞擊。
He was walking in the forest when suddenly he heard a rustling sound in the bushes.
當他走在森林裡的時候，突然聽到樹叢裡面傳來一陣窸窣聲響。
Suddenly, the lights went out during the storm.
暴風雨中，燈突然熄了。
The car suddenly stopped in the middle of the road.
車子突然就停在路的正中央。
He suddenly canceled the appointment.
他突然把預約取消了。
「突然」還有另一種表現方式是「all of a sudden」。它和「suddenly」意思相同，同樣是指有突發事件或變化發生。
All of a sudden, the car engine made a strange noise, and the dashboard lit up with warning lights.
突然之間，車子引擎發出怪聲，儀表板上的警示燈也亮了起來。
All of a sudden, the phone rang loudly, startling everyone in the room.
突然電話鈴聲大作，把房間裡面的人都嚇了一跳。
All of a sudden, he burst into tears when he heard the sad news.
當他聽到這則讓人悲傷的消息，突然就哭了起來。
abruptly
「abruptly」是一個副詞，表示「突然、忽然、毫無徵兆地」。
同樣用於表示事件突然發生或情況急遽變化。一般用在負面場景，有一種發展急轉直下的感覺。
He left the meeting abruptly, without saying a word.
他突然一言不發地離開了會議。
The car came to a halt abruptly when the brakes failed.
剎車故障，車子突然停了下來。
She changed her mind abruptly and decided not to go to the party.
她突然改變主意，決定不去參加派對了。
She woke up abruptly from a bad dream.
她突然從惡夢中驚醒過來。
The music stopped abruptly, leaving the audience in silence.
音樂突然停下來，觀眾席一片安靜。
The mood in the room shifted abruptly when the boss entered.
老闆一進來，整個房間的氣氛立刻變得不一樣了。
instantly
「instantly」是一個副詞，表示「即刻、馬上」的意思。
用於形容事件或情況發展之迅速，如例句：「一按下開關，燈馬上就亮了起來」。
When he called for help, the paramedics arrived instantly.
他一呼叫救援，救護人員馬上就到了。
She recognized him instantly, even though they hadn’t seen each other in years.
雖然已經好幾年沒見面，她還是立刻認出他來。
The magician made the rabbit disappear instantly with a wave of his wand.
魔術師棒子一揮，兔子馬上就消失了。
The alarm system was triggered instantly when the intruder broke into the house.
入侵者一闖進屋子哩，馬上就啟動了警報器。
As soon as the referee blew the whistle, the soccer players started running instantly.
裁判一吹哨，足球員們馬上就跑了起來。
With the press of a button, the machine can make coffee instantly.
只要按個鍵，這台機器馬上就可以做出一杯咖啡。
