energy，power，strength和force均可表示“力”，但energy意为“能量”，尤指人在做某事并为完成该事所表现出的生机勃勃的力，多用作不可数名词。You are always full of energy. 表示“你总是精力充沛”。power意为“能力”，词义丰富，可指内在的或外加的力、潜在的或活动的力、具体的或抽象的力、身体的或精神的力等。force意为“力”，常指促使物体运动的力，也可指势力、武力或暴力，可用作可数名词和不可数名词。strength意为“体力”，常指人体或物体内存在的力，如气力、耐力、抵抗力，有时也可指进行某种活动的推动力，是不可数名词。
The work took me a lot of energy.这工作花费了我很多精力。
The old man pulled the wagon with all his force.老人用尽全力拉货车。
The man has strong desire for power.这人渴望拥有权力。
These two boys are equal in strength.这两个男孩力气相等。
一、energy 自然界的能量；人的活力，精力，更多着眼于人的精神状态。be full of energy 精力充沛。
The task will take an enomous amount of time and energy.
二、force 军事力量，武力；物体间的作用，物理学上的力。
The force of the explosion broke all the windows.
三、power 权力，权势，职权；电力；做一件事所依赖的能力。
Congress has the power to declare war.
四、strength 人的体力，力气；物理的强度。
A washing machine is a saver of time and strength.
Exercise: Fill in the blanks.
1. Many countries are increasing their use of natural gas, wind and other forms of ________ .
2. The ________ of the government has increased greatly over the past century.
3. Gandhi insisted on winning independence by peaceful struggles, not by _________ .
4. Bill was doing a lot of physical exercise to build up his _________ .
keys 1 energy 2 power 3 force 4 strength
Multiple choice
1. --- You are always full of _________ . Can you tell me the secret ?
--- Taking plenty of exercise every day.
A. power B. strength C. force D. energy (07福建)
2. I didn`t have the _______ to get out of bed.
A. energy B. strength C. force D. spirit
keys 1 D 2 B
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