It has been said that everyone lives by selling something. ^抛出论点

It + 被动 + that ^{引导的主语从句}

live by doing ^{靠某种职业为生}

• He lives by writing.
• He lives by sewing. 
• The nomads who made these markings lived by hunting and fishing during the last Ice Age which began about 35,000 B.C. and ended about 10,000 B.C.

live on sth. ^{靠某种食物或生活来源为生}

• He lives on meat and milk.
• He lives on salary.
• He lives on his parents. ^啃老

feed on sth. ^{动物以...为主食}

• Cows feed on hay.

prey on sth. ^{肉食性动物以别的动物为食}

• Owls prey on mice.

In the light of this statement, teachers live by selling knowledge, philosophers by selling wisdom and priests by selling spiritual comfort. ^{举例（论据）}

in （the） light of sth. ^{根据...;鉴于...}

Reading is thought to be a kind of conversation between the reader and the text. The reader puts questions, as it were, to the text and gets answers. In the light of these he puts further questions, and so on.

He explores such problem consciously, articulately, and frankly, first by asking factual questions, then by asking moral questions, finally by suggesting action which seems appropriate in the light of the factual and moral information which he has obtained.

并列句中重复的谓语动词可省略

• Mary was happy, but / and / while / whereas Jane (was) miserable.
• Mary was happy when Jane was miserable.

parallelism ^{排比（中国排比字数相当、英文排比三个或者以上，结构相当、谓语相同）}

Some books are to be tasted, others to be swallowed, and some few to be chewed and digested. — Francis Bacon

Reading makes a full man, conference a ready man, and writing an exact man. — Francis Bacon

It is said that in England death is pressing, in Canada (death is) inevitable and in California  (death is) optional. Small wonder. Americans' life expectancy has nearly doubled over the past century. Failing hips can be replaced, clinical depression can be controlled, cataracts can be removed in a 30-minutes surgical procedure.

Though it may be possible to measure the value of material goods in terms of money, it is extremely difficult to estimate the true value of the services which people perform for us. ^{论证（讲道理）}

Possible as it may be to measure the value of material goods in terms of money, ... ^{让步状语从句的强调}

• Although she is beautiful, I still don't like her. → Beautiful as she is, I still don't like her.

in terms of ... ^{以某种方式；从某个角度}

• In terms of money we're rich, but not in terms of happiness.

There are times when we would willingly give everything we possess to save our lives, yet we might grudge paying a surgeon a high fee for offering us precisely this service. ^论证

Ther be 固定句型表达时间状语 ^{作文加分项（比副词严肃庄重）}

we might grudge the high fee we would pay a surgeon for offering us precisely this service. ^替换

for 等价交换

• She gave me $30 for my bike.
• She bought my bike for $30.
• for nothing ^免费
• Advertisers discovered years ago that all of us love to get something for nothing.

造句：There are times when we would willingly pay tips and compliments to the waiters who serve us, yet we might grudge giving thanks to our mothers for offering us precisely this service.^{有时候我们愿意给为我们服务的侍者小费并称赞他们，但是在母亲为我们提供一样的服务的时候我们却吝惜感谢之辞。}

The conditions of society are such that skills have to be paid for in the same way that goods are paid for at a shop. ^感慨

Such are the conditions of society that skills have to be paid for in the same way that goods are paid for at a shop. ^{such位于句首引起部分倒装}

• Such is human nature, that a great many people are often willing to sacrifice higher pay for the privilege of becoming white-collar workers.

造句：The conditions of schools are such that A-students are respected in the same way that achievers are esteemed in society.^{学校里的情况就是这样，优等生受到尊敬，正如社会上成功者受人景仰一样。}

Everyone has something to sell. ^{最后总结（呼应段首）}

1. topic sentence ^主题句
2. supporting sentences ^{扩展句（论证和论据）}
3. concluding sentence ^总结句