雅思写作如何正确表达倍数与百分比
在雅思写作中，我们经常要表达“A是B的n倍。”也就是说，我们要学会比较数据，今天，小编就教大家如何正确运用形容词比较级和百分比对比、描述数据。同时，还为大家总结了经常容易混淆的时间介词。
雅思写作如何正确表达倍数与百分比
一、用“平级”或“比较级”表达倍数
表达倍数时，既可以用“平级”，也可以用“比较级”。
如：A楼的高度是B楼的三倍(A楼比B楼高两倍)。
Building A is three times as tall as Building B. (平级)
Building A is three times taller than Building B. (比较级)
在倍数比较的句子中，常见的错误之一，是形容词与其所修饰的名词不搭配。
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. ×
在汉语里，可以用“多”和“少”来形容人口，于是很多人会用as many as。而句中的主语是population, 只可以用large/big/small来形容。
二、百分数的表达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
数词+percent+of+sth：后面谓语的单复数以percent后面跟接的主语(sth)为主
例如:
20 percent of the apples are eaten. (这里是复数的可数名词，所以用复数。)
20 percent of the water is drunk.(这里是不可数名词，所以用单数。)
◆Percentage: portion or amount of something
The percentage of +sth+ is：注意这里不管后面跟的是什么词,都用第三人称单数
The percentage of the students is 46.
The percentage of the water is 46.
That was a high percentage.
常见错误：
Percent is only used after a number. If you are referring more generally to part of an amount, use percentage.
Percent仅用在数字之后，如果更笼统表示数量中的一部分，可用percentage:
A high percentage (不说percent) of the population was illiterate.
绝大部分人口是文盲。
三、时间介词at on in
◆at用在时间点前：
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用在时间段，月份，年和季节前：
The lecture is in the morning.
The lecture is in June.
The lecture is in 2004.
The lecture is in winter.
我们把这几个时间介词都放在一句话中：
The lecture is at 7.00, in the morning, on Thursday, on 27 October, in 2004.
雅思写作观点语料：transport
Transport交通相关语料
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
相关雅思历史真题
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?
雅思写作观点语料：水资源
Water水资源相关语料
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
相关雅思历史真题
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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