act=to do（做）
=to drive（驱使）
来自于拉丁动词agere的分词形式actum的词干部分
act=to do（做）
词义：v.1.行动、做某事（to do sth. for a particular purpose）特定的目标/目的
We must act at once.
The girl's life was saved because the doctors acted so promptly.(adv. 迅速地)
2.起作用（function）
Alcohol act quickly on the brain.（酒精在大脑迅速产生影响）
Alcohol act promptly on the brain.
3.演出、扮演
The play was well acted.（这出戏演得很好）
n.1.行为（sth. that sb. does）
an act of kindness （善行）
No act of kindness is ever wasted. 善有善报
in the act （of doing sth.）正在（做某事）；当场（while you are doing sth）
The thief was caught in the act.（小偷当场被抓了）
He was caught in the act of stealing a car.(他偷车的时候被当场抓住了)
2.一幕演出；（议会通过的）法令
延展：actor[act+or人]n.男演员、行动者
actress【act+-ress女性】n.女演员
overact【over-+act】v.(通常在戏剧中)表演得过于夸张
action=act+-ion（名词后缀）
词义：n.行动（行动的一个过程）the process of doing sth.
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。
n.（一种物质或化学品对另一种所起的）作用effect
the action of sunlight on the skin(阳光对皮肤的作用）
n.诉讼 legal process
He is considering taking legal action against the hospital.
他正在考虑起诉这家医院。
actionable【action+-able】a.可提起诉讼的
active=act+-ive（形容词后缀）
adj.（人）积极（参加体能活动）的，活跃的、积极的
I needed to change my lifestyle and become more acrive.
我需要改变我的生活方式，活动得更多些。
Although he is over 70,he is still active.
他虽然年过70，但依旧很活跃。
activate【activ（e）+-ate】vt.使活动、激活
activity【activ（e）+-ity】n.活跃；【复数】活动
activities【复数】活动
The streets were noisy and full of activity.
街上熙熙攘攘，车水马龙。
outdoor/classroom activities 户外/课堂活动
activist【activ（e）+-ist】n.活动分子，积极分子
actual=act+-u-+-al（形容词词尾）
词义：adj.实际的；现实的（existing in fact；real）
What were his actual words?他的原话是什么？
James looks younger than his wife but in actual fact(=really)he is five years older.
詹姆斯看起来比他妻子年轻，但实际上他还大五岁。
actualize【actual+-ize】vt.实现；使发生
He finally actualized his dream.他最终实现了自己的梦想。
actually【actual+-ly】adv.事实上
actuality【actual+-ity】n.事实
react=re-（回返back）+act（做to do）
词义：v.反应（do or act in reply）
She was slow to react.她反应迟钝。
react against sb./sth.反对、反抗
The villagers reacted against oppression by un uprising.
村民们举行暴动反抗压迫。
reaction【react+-ion】n.反应
reactor【react+-or】n.核反应堆
interact=inter-（between在....之间）+act（做）
词义：V.1.互相作用，互相影响
Economists also study how people interact with one another.
经济学家也研究人与人之间如何相互影响。
2.交流、互动
Teachers have a limited amount of time to interact with each child.
教师和每个孩子沟通的时间有限。
interaction【interact+-ion】n.相互作用
interactive【interact+-ive】adj.互相作用的
exact=ex-（出out）+act（驱使to drive）
词义：vt.强求，索取（to demand and get sth. from sb.）
She was determined to exact a promise from him.
她决意要他做出承诺。
adj.准确的；精确的（correct in every detail）
What were his exact words?他的原话是什么？
exactly【exact+-ly】adv.准确地；精确地
transact
=trans-（穿过；通过 across or through）+act（驱使to drive）
词义：v.（与人或组织）做业务；做交易（to do business with a person or an organization）
He transacted some business at bank.
他在银行处理了一些事务。
transaction【transact+-ion】n.交易，业务；处理
