雅思写作，语法知识是必备要掌握的基础，其中最需要介绍的就是定语从句、宾语从句、状语从句3个语法点。
当然除语法之外，一篇优秀的雅思作文离不开逻辑论证方法的表达。都妹也为给大家带来雅思写作中的因果逻辑讲解，了解其中相关词汇以及用法。
— 必备语法知识点 —
雅思写作5.5分以上必备三大经典从句：定语从句、宾语从句、状语从句一定要了解！
定语从句：
多用who(指人)、which(指物)、that(即可指人也可以指物)，还有一个经典的容易被忽视的定语从句在大作文中可以表达事件发生的原因：即由why引导的固定句型...the reason(s) why...
例句：
There may be some reasons why entertainment stars earn high salaries but overall Iagree that they are overpaid.
宾语从句：
文章中提出观点的好句型，无论是你自己的观点还是文章中原来给出的观点都可以。建议多用that引导的，不容易出错，如：some people think/agree/suggest/insist that...
例句：
A growing number of parents believe that being overly dependent on social networkingwebsites only makes their children more isolated in the real world.
状语从句：
状语的种类特别多，所以状语从句是你最能够表现句型多样化的机会。牢记以下几种状从的分类，句子的丰富性自然就出来了：
A.时间状语从句引导词：
when/as/while/since/the moment...
例句：
The related sectors should take effective measures the moment the problem appeared.
B.地点状语从句引导词：
where/wherever
例句：
Generally，air will be heavily polluted where there are factories.
C.原因状语从句引导词：
because/since/as/seeing that...
例句：
As this policy would also affect the cost of public transport, it would be very unpopularwith everyone who needs to travel on the roads.
D.条件状语从句引导词：
if/as long as/providing that/provided that...
例句：
The government will increase its support for public education, provided that such funds canbe put to good use.
E.让步状语从句/即转折关系引导词：
though/although/while/
no matter who/where/which/how...
例句：
While (表示二者对比)some people link happiness to wealth and material success, othersthink it lies in emotions and loving personal relationships. *Even though it is unlikely that all workers do feel happy in their work, I think it is notunrealistic to promote more job satisfaction in any job.
— 因果逻辑相关词汇 —
因果关系的表达中大家最熟悉的莫过于BS（because / so），还有很多其它表示因果关系的表达。
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。
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）
3. thanks to （positive situations 通常适用于结果好的时候）
due to （negative situations通常使用与结果不好的时候）
owing to / attributable to /on account of
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 ...
5. caused by / result from 也表原因
So系列（表结果）
1. thus/ therefore / thereby / hence
thus：表示‘in this/that way’
therefore：表示 ‘for this reason’ /‘because of this or that’
thereby：by that means， as a result of that
hence：表示 ‘from this/that’
2. as a result / as a consequence
3. consequently /accordingly
consequently 更偏重因果逻辑；accordingly 更偏重后续解决
名词系列（因果）
1. cause （of sth）/ reason 原因
Obesity can be divided into three main causes – diet, lifestyle and education.
2. result （for sth）/ effect 结果
Another result is lack of self-esteem.
3. causality 因果关系（cause and effect） causation 原因
The correlation between population and housing price does not indicated causality, only the association.
4. impact/influence 影响
This area is often overlooked but has a tremendous impact on your life.
形容词系列（因果）
表示因果的形容词不是很常用，使用时多和 factor, element 结合。
1. causal 原因的，因果的
Low income and elderly are among the potential causalfactors of prevalence of obesity among adults.
2. consequential 结果的，随之发生的
Measures other than ratings will prove more consequential.
3. influential 影响的，有影响力的（大多数情况下使用第二个意思）
Family is the most influential factor on happiness.
希望这些语法和词汇，小伙伴可以很快掌握，顺利提高雅思写作成绩~
