each / every 　 each other / one another 　 eager / anxious / keen 　 earthly / earthy 　 economic / economical 　 effective / efficient 　 egoism / egotism 　 either...or / neither...nor 　 elegy / eulogy 　 elicit / illicit 　 emigrate / immigrate / migrate 　 eminent / imminent 　 en route 　 enough 　 enthuse 　 enviable / envious 　 equable / equitable 　 ethical / moral 　 euphemisms 　 even 　 excuse me / pardon me / I'm sorry / apologize 　 extinguish / put out / go out

effective / efficient 　 　 A. effective는 효력이 있는, 효력이 발생되는 의 의미로 사용된다. 1. The medication is quite effective; it relieves pain quickly. 2. The law becomes effective at midnight. 3. The law was effective on January 1. 4. The law passed by Congress became effective as soon as the President signed it. 　 　 B. efficient는 효율적인, 능률적인 의 의미로 사용된다. 1. She performs her job well and quickly; she is very efficient. 2. An efficient worker makes good use of his or her skills. 3. She's an efficient manager. 4. She was an efficient secretary.

The law was effective on January 1. 　 She was an efficient secretary.

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