雅思写作中，行文的逻辑严密性十分关键，有理有据，不多不少刚刚好地把你的观点，论据串联表达出来。下面是几个高分句型：
1.?双名词从句式
Another?reason?why?people?from?the?countryside?transfer?to?the?city?is?because?of?the?modern?conveniences?that?city?living?brings.
解析：适用于引入原因(带题目关键词)
句型框架：主语从句+?is?because?of?the?原因?+宾语从句?(包括主从，宾从两个名词性从句)
例句中，people?from?the?countryside?transfer?to?the?city?是对题目关键信息的复述，句型中“原因”部分使用一个名词或名词词组。
Exercise:?causes?of?congestion?in?megacities
2.?三组P+O式
Today?more?and?more?people?rely?on?cars?instead?of?walking,?have?less?physical?demands?at?work?and?prefer?inactive?leisure?activities.?This?results?in?burning?less?calories?and?gaining?weight.
解析：适用于解释句，说明三种具体原因或结论段总结原因和结果
句型框架：主语+?P.O.1?,?P.O.2?and?P.O.3?.?This?results?in?doing?sth.1?and?doing?sth.2.
例句中，三组P+O?(谓语+宾语)是平行结构，第二句的”This”?指代三组P+O;?doing?sth.1?是result，doing?sth.2是ultimate?result。
Exercise:?causes?of?overpopulation
3.?“原因+细化方面解释”?式
Effluents?are?another?by-product?of?industries?which?poses?threat?to?the?environment;?leather?and?tanning?industries,?petroleum?industries?and?chemical?manufacturing?industries?create?major?waste?products?which?are?released?directly?into?nearby?streams?without?treatment,?creating?river?pollution?and?causing?harm?to?aquatic?life.
解析：适用于说明一个原因(论点)后紧接着把这个原因的几个方面具体化论述。
句型框架：原因?is?another?by-product?of?…?which?poses?threat?to?主题词;?具体方面1，具体方面2?and?具体方面3?create?…?which?are?V+ed?….without…,?V+ing?…..to?…
例句中，which?are…的部分是定语从句，Ving…to…是非谓语用法。
Exercise:?cyber?crime
4.?X(root?cause),?Y(cause),?Z(result)式
Some?people?believe?that?global?warming?is?a?result?of?burning?fossil?fuels,?as?this?causes?increased?carbon?dioxide?in?the?atmosphere.
解析:?这里我们把造成global?warming?(result)的原因分为burning?fossil?fuels(root?cause)和increased?carbon?dioxide(cause),?原因和根本原因，然后用适合的句式组织起来，使得逻辑论证层次更丰富。
句型框架：?Some?people?believe?that?…(result)?is?a?result?of?…?(root?cause),?as?this?causes?….(cause).
Exercise:?cause?and?root?cause?of?obesity
5.?“双非谓语”?结构
Air?pollution?resulting?from?the?factory?and?vehicle?emission?poses?serious?health?concerns,?considering?the?irritation?of?the?eyes,?nose,?and?throat,?as?well?as?increased?risk?of?heart?attack.
解析：把问题的原因和具体结果都用非谓语形式体现，主语只说关键词造成问题(概括性的名词)，即air?pollution?poses?serious?health?concerns.
句型框架：关键词?resulting?from…?and?…?poses?serious?…concerns,?considering?…?as?well?as…
例句中，描述air?pollution?的形成原因部分resulting?from和造成的健康问题具体包括什么considering都使用的是非谓语形式。
Exercise:?cause?and?effect?of?social?networking
句型虽好，可不要贪心。具体写作时并不是复杂句越多越好，一篇文章中用1-2个这样的逻辑句型就可以，大多数还是要使用基础句型，逻辑清晰，准确表达更重要。
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