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1. 双名词从句式
Another reason why people from the countryside transfer to the cityis because of the modern conveniencesthat 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 workand prefer inactive leisure activities. This results inburning less caloriesand 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.1and 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
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: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...