雅思寫作備考_因果關系表達句型

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1. 雙名詞從句式

Another reason why people from the countryside transfer to the cityis because of the modern conveniencesthat city living brings.

解析：適用于引入原因(帶題目關鍵詞)

句型框架：主語從句+ is because of the 原因 +賓語從句(包括主從，賓從兩個名詞性從句)

例句中，people from the countryside transfer to the city 是對題目關鍵信息的復述，句型中原因部分使用一個名詞或名詞詞組。

Exercise:causes of congestion in megacities

2. 三組P+O式

Today more and more people rely on cars instead of walking, have less physical demands at workand prefer inactive leisure activities. This results inburning less caloriesand gaining weight.

解析：適用于解釋句，說明三種具體原因或結論段總結原因和結果

句型框架：主語+P.O.1 , P.O.2 and P.O.3 . This results in doing sth.1and doing sth.2.

例句中，三組P+O (謂語+賓語)是平行結構，第二句的This 指代三組P+O; doing sth.1 是result，doing sth.2是ultimate result。

Exercise:causes of overpopulation

3. 原因+細化方面解釋 式

Effluentsare another by-product of industries which poses threat to the environment;leather and tanning industries, petroleum industriesand chemical manufacturing industriescreate major waste productswhich are released directly into nearby streams without treatment, creating river pollution and causing harm to aquatic life.

解析：適用于說明一個原因(論點)后緊接著把這個原因的幾個方面具體化論述。

句型框架：原因is another by-product ofwhich poses threat to 主題詞; 具體方面1，具體方面2and 具體方面3create which are V+ed .without, V+ing ..to

例句中，which are的部分是定語從句，Vingto是非謂語用法。

Exercise:cyber crime

4. X(root cause), Y(cause), Z(result)式

Some people believe that global warmingis a result of burning fossil fuels, as this causesincreased carbon dioxidein the atmosphere.

解析: 這里我們把造成global warming (result)的原因分為burning fossil fuels(root cause)和increased carbon dioxide(cause), 原因和根本原因，然后用適合的句式組織起來，使得邏輯論證層次更豐富。

句型框架： Some people believe that (result) is a result of(root cause), as this causes .(cause).

具體的句式組織還可以是以下五種，R(result), C(cause), RC (root cause):

(R) has been directly affected by (RC), as this allows for (C).

As a result of (RC) leading to (C), (R) has been possible.

(RC), thus allowing for (C), has resulted in (R).

(RC) results in (C), which in turn leads to (R).

Given (RC), it follows that (C) would mean (R)

5. 雙非謂語 結構

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：把問題的原因和具體結果都用非謂語形式體現(xiàn)，主語只說關鍵詞造成問題(概括性的名詞)，即air pollutionposes serious health concerns.

句型框架：關鍵詞 resulting from andposes serious concerns, consideringas well as

例句中，描述air pollution 的形成原因部分resulting from和造成的健康問題具體包括什么considering都使用的是非謂語形式。

Exercise: cause and effect of social networking

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