act和action的区别主要在于含义、用法及词性上。act可作名词和动词，含义为“所为”、“行为”、“表演”、“假装”、“举止”；action可作名词和及物动词，含义为“行为过程”、“诉讼”、“务必做”。
一、act的基本意思及用法介绍
act可作名词和动词，意为行为，行动，所为;做事;行动;行为;举止;表演，假装。
例句：The murder was the act of a psychopath.
这次谋杀是精神变态者所为。
Don't take her seriously─it's all an act.
别跟她认真——这全是假戏一场。
The hero dies in Act 5, Scene 3.
男主角在第五幕第三场死去。
They were one of rock's most impressive live acts.
他们是最富感染力的现场表演摇滚乐组合之一。
It is vital that we act to stop the destruction of the rainforests.
至关紧要的是，我们应当采取行动制止破坏雨林。
Stop acting like spoilt children!
别再像惯坏的孩子那样胡闹了！
He's been acting the devoted husband all day.
他整天装作模范丈夫的样子。
Can you act as interpreter?
你能担任口译吗？
Alcohol acts quickly on the brain.
酒精对大脑迅速产生影响。
二、action的基本意思及用法介绍
action可作名词和及物动词，意为行动;行为过程;所做之事;行为;诉讼;起诉；务必做，确保处理(某事)。
例句：She began to explain her plan of action to the group.
她开始向小组讲解她的行动计划。
Her quick action saved the child's life.
她行动迅速，救了小孩的命。
He is considering taking legal action against the hospital.
他正考虑起诉这家医院。
I like films with plenty of action.
我喜欢情节曲折离奇的影片。
Your request will be actioned.
你的要求会处理的。
