1. ag, act

ag, act [L] = to do, to drive 做，驱使

• 词根ag来自拉丁动词agere的词干部分，意思相当于英语的to do（做）或to drive（驱使）。

• act是个英语核心单词，其实它的前身act是ag的同源异形词根，来自agere的动名词形式 actum的词干部分，基本含义也是to do或to drive。

ag - 常见派生词

agent

n. [ag=to do做；-ent n.=person人→“person who does 办事者”→]

【释义】person who works for another person or organization 代理人

a sales agent 代售商

• agential [agent;-ial a.] a.代理人的；起媒介作用的

agency

n. [ag=to do做；-ency n.=the quality or state of 表性质或状态→“the abiliy or place of doing business 办事的能力或场所”→]

【释义】

① power or force which causes a result 力量；作用

human agency 人力

② the office of an agent;service organization 代理处；机构

travel agency 旅行社

agenda

n. [ag=to do做；-enda（-a表复数）n.=things事情→“things to be done要办的事项”→]

【释义】list of things to be discussed or decided upon 议事日程

the most important item on the agenda 议事日程的首项

agile - ['ædʒl]

a. [ag=to do做；-ile a.=able能……的→“able to do能干的”→]

【释义】able to do or move quickly or easily 敏捷的；灵活的

as agile as a monkey像猴子般灵活

• agility [agil(e);-ity] n.敏捷；灵活

agitate - [ˈædʒɪˌteɪt]

v. [ag=to drive or keep moving 驱使，使运动；-itate（-ate）v.=make or cause使……→“cause to keep moving steadily引起不断的动荡”→]

【释义】disturb 鼓动

The audience were agitated by his speech 听众被他的演说所鼓动

• agitation [agitat(e);-ion n.] n.鼓动；激动不安

• agitator [agitat(e);-or n.] n.鼓动者

act - 常用同根词

act

v. [act=to do 做→“to do what is required 做要求的事”→]

① do something行动

to act at once 立刻行动

② function起作用

The brakes wouldn't act.刹车失灵。

③ take part in a play or film扮演

Who is acting Hamlet? 谁演哈姆雷特？

• actor [act;-or n.] n.男演员；行动者

• actress [act (o)r;-ess n.] n.女演员

• re-act [re-;act v.] v.重做，再做；重演，再演

• overact [over-;act v.] v.演得过于夸张

action

n. [act=to do做；-ion n.=the process or result表过程或结果→]

① process of doing, or deed 行动，活动

Actions speak louder than words.行动比语言更有说服力。

② result of doing, or effect 作用

the action of an acid on metal 酸对金属的作用

③ charge 诉讼

to bring an action against someone 起诉某人

• actionable [action;-able a.] a.可控诉的

active

a. [act=to do做；-ive a.=able会……的→]

【释义】able to do活跃的，积极的

Although he is over 70, he is still active.他虽然年过70，但依然很活跃。

• activate [activ(e);-ate v.] v.使活动

• activism [activ(e);-ism n.] n. [哲] 能动主义；积极，活跃

• activist [activ(e);-ist n.] n.活动分子，积极分子

• activity [activ(e);-ity n.] n.能动性；活跃；[复] 活动

actual

[act=to do做；-u-;-al a.=the act or fact 表行为或事实→]

【释义】a. existing in fact;real 实际的；现实的

the actual amount of money实际金额

• actualist [actual;-ist n.] n.现实主义者

• actuality [actual;-ity n.] n.事实，现存情况；现实性

• actualize [actual;-ize v.] v.实行，使现实化

actuate - ['æktʃuet]

[act=to do做；-u-;-ate v.=to make or cause使……→]

【释义】v. cause to do 驱动，激励

What motives actuated her? 什么动机驱使她这样做的？

• actuation [actuat(e);-ion n.] n.驱动，激励；开动

exact - [ɪɡ'zækt]

[ex-=out出；act=to drive驱使→“to drive out;driven out逼出来（的）”→]

【释义】v. demand or obtain by force 强求，索取

He exacted obedience from his students.他强要学生服从他。→

【释义】a. correct and without mistake 准确的，精确的

to be exact in conduct行为一丝不苟

• exacting [exact v.;-ing a.] a.苛求的，严厉的；强索的

• exaction [exact v.;-ion n. ] a.强索；勒索；榨取

• exactitude [exact a.;-itude n.] n.精确（性）；严格，严谨

react

[re-=back回返；act=to do做→]

v.① do or act in reply反应

She was slow to react.她反应迟钝。

② do against反动，反作用

to react against oppression 反抗压迫

• reaction [react;-ion n.] n.反应；反作用；反动

• reactor [react;-or n.] n.引起反应的人或物；[原] 反应堆

• reactive [react;-ive a.] a.反应的；反动的

interact

[inter-=between在……之间；act=to do做→“to do between two things在两者之间互动”→]

v. have an effect on each other互相作用，互相影响

All things are inter-related and interacted on each other. 一切事物都是互相联系又互相影响的。

• interaction [interact;-ion n.] n.相互作用；相互

• interactant [interact;-ant n.] n. [化] 反应物

• interactive [interact;-ive a.] a.互相作用的；[计] 交互的

transact

[trans-=across or through穿过；act=to drive驱使→“to drive through使通过”→]

v. carry on;manage 执行，办理

He transacted some businesss at bank.他在银行处理了一些事务。

• transaction [transact;-ion n.] n.办理，处理；交易，业务

• transactor [transact;-or n.] n.办事人，处理者