在雅思寫作中，我們經(jīng)常要表達(dá)“A是B的n倍?！币簿褪钦f，我們要學(xué)會(huì)比較數(shù)據(jù)，今天，小編就教大家如何正確運(yùn)用形容詞比較級和百分比對比、描述數(shù)據(jù)。同時(shí)，還為大家總結(jié)了經(jīng)常容易混淆的時(shí)間介詞。

雅思寫作如何正確表達(dá)倍數(shù)與百分比

一、用“平級”或“比較級”表達(dá)倍數(shù)

表達(dá)倍數(shù)時(shí)，既可以用“平級”，也可以用“比較級”。

如：A樓的高度是B樓的三倍(A樓比B樓高兩倍)。

Building A is three times as tall as Building B. (平級)

Building A is three times taller than Building B. (比較級)

在倍數(shù)比較的句子中，常見的錯(cuò)誤之一，是形容詞與其所修飾的名詞不搭配。

例如：

The population of China is five times as big as that of Pakistan. √

The population of China is five times as many as that of Pakistan. ×

在漢語里，可以用“多”和“少”來形容人口，于是很多人會(huì)用as many as。而句中的主語是population, 只可以用large/big/small來形容。

二、百分?jǐn)?shù)的表達(dá)percent or percentage?

◆Percent : it is used to express proportions out of a hundred. Percent is always used with a number.

2 percent = 2%

percent = per centum

數(shù)詞+percent+of+sth：后面謂語的單復(fù)數(shù)以percent后面跟接的主語(sth)為主

例如:

20 percent of the apples are eaten. (這里是復(fù)數(shù)的可數(shù)名詞，所以用復(fù)數(shù)。)

20 percent of the water is drunk.(這里是不可數(shù)名詞，所以用單數(shù)。)

◆Percentage: portion or amount of something

The percentage of +sth+ is：注意這里不管后面跟的是什么詞,都用第三人稱單數(shù)

The percentage of the students is 46.

The percentage of the water is 46.

That was a high percentage.

常見錯(cuò)誤：

Percent is only used after a number. If you are referring more generally to part of an amount, use percentage.

Percent僅用在數(shù)字之后，如果更籠統(tǒng)表示數(shù)量中的一部分，可用percentage:

A high percentage (不說percent) of the population was illiterate.

絕大部分人口是文盲。

三、時(shí)間介詞at on in

◆at用在時(shí)間點(diǎn)前：

The lecture is at 7.00.

◆on用在星期和日期前：

The lecture is on Thursday.

The lecture is on 27 October.

◆in用在時(shí)間段，月份，年和季節(jié)前：

The lecture is in the morning.

The lecture is in June.

The lecture is in 2004.

The lecture is in winter.

我們把這幾個(gè)時(shí)間介詞都放在一句話中：

The lecture is at 7.00, in the morning, on Thursday, on 27 October, in 2004.

雅思寫作觀點(diǎn)語料：transport

Transport交通相關(guān)語料

Traffic problems

Traffic congestion is caused by commuters travelling to work

Most people live in the suburbs outside city centre

Commuters tend to travel at the same time of day

They tend to travel alone

Cars and road space are not used efficiently

This causes traffic jams during the rush hour

Traffic solutions

In order to reduce traffic we should change our working habits

The internet can now be used to connect people

More people could work from home

Meetings can be held as video conferences

Workers could be given flexible timetables

Another solution would be to tax drivers

Workers should share their cars and travel together

In London, for example, there is a congestion charge

This helps to raise money for better public transport

Public transport needs to be reliable and efficient

Positives of Public transport

We need to reduce our dependence on cars

Parking a car can be extremely difficult in big cities

Well-designed transport systems are comfortable and convenient

Modern public transport can be fast and cheap

Public transport can help to reduce pollution in cities

Investment in buses and trains will ease traffic congestion

Buses can be given special lands to avoid traffic

Negatives of public transport

Public transport if often slow and unreliable

Metro systems and trains are often dirty and crowded

People feel like “sardines in a can”

Cars are much more comfortable

Road safety

Driving while tired or drunk is extremely dangerous

Mobile phones can be a dangerous distraction for drivers

They draw the driver’s attention away from the road

The use of phones while driving has been banned in many countries

Punishments are becoming stricter

Television campaigns are used to remind people to drive safely

Speed cameras have become more common

Speed bumps are another form of traffic calming

Many streets are designed with the aim of slowing traffic down

相關(guān)雅思?xì)v史真題

1.In cities and towns all over the world, the high volume of traffic is a problem. What are the causes of this and what actions can be taken to solve this problem?

2.Traffic congestion is becoming a huge problem for many major cities. Suggest some measures that could be taken to reduce traffic in big cities.

3.In order to solve traffic problems, governments should tax private car owners heavily and use the money to improve public transportation. What are the advantages and disadvantages of such a solution?

雅思寫作觀點(diǎn)語料：水資源

Water水資源相關(guān)語料

Importance of clean water

Water is as necessary natural resource

Humans need access to clean, safe drinking water in order to live

Poor water quality is a major cause of disease and death in some countries

Water usually needs to be treated before we can drink it

Developing countries often lack the means to treat and supply water to citizens

Developed countries tend to have much better sanitation

Citizens have access to clean tap water

Drinking water is not contaminated by sewage or waste water

The supply of clean water would improve public health in many developing countries

Water supply

Urban life would be impossible without water supply systems

These systems are massive engineering projects

Many professionals are involved in their planning, construction and maintenance

The supply and distribution of water are major concerns

Water is becoming scarce in some countries

Areas that suffer droughts often need to import water

As populations grow, there is more pressure on water supplies

This could lead to a water crisis

Water and politics

The supply of water is also an important political issue

Huge amount of water are needed for agriculture and industry

The irrigation of crops accounts for a large proportions of water use A water crisis could lead to political conflicts or even wars

Argument: water should be free

Some people believe that water should be free for everyone

Governments should supply water to all homes at no cost

Private companies should not be allowed to profit from this natural resource

Money from taxes can be used to pay for water supply systems

Argument: water should not be free

If water is free, people take it for granted

They do not think about how much water they waste

They leave taps running while washing or brushing their teeth

If we have to pay for water, we will use it more responsibly

Water supply systems are extremely expensive

Investment is needed to maintain and improve them

Private companies may provide a better service than governments

If they provide an efficient service, they will make more money

They will repair leaks to avoid losing money

Bottled Water: Opinions

Some people carry bottles of water wherever they go

For example, they take bottles of water to work or to the gym

They believe that bottled water is healthier than tap water

They also argue that it tastes better

However, other people believe that we should consume less bottled water

Plastic water bottles add to litter and waste problems

Companies should not be able to make a profit from water

It is unethical to make money by selling packaged water

There is no difference in quality between bottled and tap water

相關(guān)雅思?xì)v史真題

1.Fresh water has always been a limited resource in some parts of the world. Today, however, growing worldwide demand has made this a global problem.

What are the causes of the increased demand and what measure could governments and individuals take to respond to this problem?

2.Water is a natural resource that should always be free. Governments should ban the sale of bottled water.

To what extent do you agree or disagree?

3.Water resources around the world are falling deficient. Analyze the possible reasons and provide your suggestions.

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