雅思大作文中有一类题目是因果关系类，具体包括三小类：cause and effect、cause and solution、problem and solution。这三小类问题也可以穿起来，即针对某个topic的cause—effect（即problem）– solution。

　　无论哪种题目，写明因果关系很重要。关于因果关系的表达同学们都很熟悉，无非是BS（because / so），而且大家也一定很清楚的知道BS在英语中，用了前者就不能用后者的道理。例如

　　Becausefurther education has become more accessible for a wider range of people, an increasing number of people have degrees

　　Further education has become more accessible for a wider range of people, so an increasing number of people have degrees.

　　但是除了BS之外，还有很多其它表示因果关系的表达，具体如下：

　　Because系列（表原因）：

　　1. because of : because后接的是一个句子（主谓宾)；because of 后一般直接跟名词。例如：

　　Because ofthe increasing number of machine—and as we noted before, machines magnify human effort—then anyone using a machine can

　　get a higher wage than anyone not using a machine.

　　2. as / since (除了“因为“外，还有”自从”的意思，使用时要注意避免歧义)

　　Hours spent on commuting, traffic jams, and fights for parking should diminish, sinceworkers make fewer journeys or work staggered hours

　　Unfortunately, as the number of people living in the city increases, so do the different problems associated with population growth. （注意此句中的so不表示“所以”，而是“…也…”的意思）

　　3. thanks to (positive situations 通常适用于结果好的时候)

　　Thanks to new technology, it's easier than ever to work remotely.

　　due to (negative situations通常使用与结果不好的时候)

　　owing to / attributable to /on account of

　　Due to /… / On account of extreme weather conditions, damage to property occurs.

　　4. 当原因需要的表达较多时，我们还可以把以上表达改写为原因状语从句，使用thanks to the fact that / due to the fact that /owing to the fact that 或者on the grounds that ,,,

　　Will we live longer merely due to the fact that  / on the grounds that technology, if implemented properly, will take stress away from our lives

　　5. caused by / result from 也表原因

　　Many car accidents were resulted from / caused by a lack of guardrails

　　So系列（表结果）：

　　1. thus/ therefore / thereby / hence

　　thus: 表示‘in this/that way’

　　As a country develops, its cities become the engines of development, thus jobs are available in these areas.

　　therefore: 表示 ‘for this reason’ /‘because of this or that’

　　Therefore, the influence of the peer group is important both for one’s own competence and for the relative evaluation of the process itself, given that one sees oneself in relation to others.

　　thereby: by that means, as a result of that

　　In some countries, reduced budgets have led to the elimination of busing systems, thereby increasing the use of cars and the congestion they create.

　　hence: 表示 ‘from this/that’

　　Drinking lots of water is healthy and reducing plastic waste is great for the environment. Hence, trendy reusable water bottles that you can refill yourself are health-promoting, eco-friendly, and green.

　　2. As a result / As a consequence

　　As a result, those people who were indoors had much lighter skin, which means that whiter skin is now associated with having a higher status than dark skin.

　　As a consequence, environmental health must address the societal and environmental factors that increase the likelihood of exposure and disease.

　　3. consequently /accordingly

　　Consequently 更偏重因果逻辑；accordingly 更偏重后续解决

　　Water pollution affects drinking water, rivers, lakes and oceans all over the world. This consequently harms human health and the natural environment.

　　Some of the laws were contradictory. Accordingly, measures were taken to clarify them.

　　Cause系列（表结果）：

　　1. cause (v.) 引起

　　The amount of garbage produced by the people also increases whichcauses sanitary landfills to fill up faster.

　　2. lead to/ result in 导致

　　注意这里是result in, 后跟结果，前面提到的result from后面跟的是原因。

　　The society’s attitude to food often leads to over-consumption.