托福写作重点语法积累原因状语从句

考生们想法考试取得理想的成绩，那么托福写作重点语法的积累是一项必备的基本功，南京新航道的新航道的小编特意为考生们整理了原因状语从句的解析及例句，希望对考生们有所帮助！
托福写作例句1
Not only is it harder to get enough exercise,(but)it is also harder to find healthy food to eat because most of our food is contaminated by pesticides.
句子结构：本句是由because连接的主从复合句。Because表示“因为……”，引导原因状语从句。主句中，not only…(but)also…，表示“不仅……而且……”，表递进关系。并且在but后半句中，用了主语倒置的结构，即it是形式主语，真正的主语是后面的to do不定式。
托福写作例句2
I was shocked because I was taught never to litter and to try to take care of my community.
句子结构：本句结构简单。主句和从句由连词because连接，此处because表示“因
为……”，引导原因状语从句。
托福写作例句3
It is just as important for older people to study and learn new things as it is for younger people,because learning keeps the mind strong,helps older people to continue to contribute to society,and also provides an invaluable opportunity for networking.
句子结构：本句是由because连接的主从复合句。主句中as…as…是固定搭配，表示
“和……一样……”。两个as中间常跟形容词或副词原级，否定句中个as可以换成so。Because表示“因为……”，引导原因状语从句。
托福写作例句4
People are less interested in improving their neighborhoods than in the past because they do not know their neighbors,they are rarely at home,and they move frequently.
句子结构：主句和从句由连词because连接。Because表示“因为……”，引导原因状语从句。
托福写作例句5
If the people around the world were to keep up with current events not only for their home countries,but for the global community as well,they would become wiser,learned in the ways of other cultures and governments,and possibly moved to act on behalf of all people,and not just
those with the same nationality.
句子结构：If表示“如果……”，引导原因状语从句。在该从句中not only…but also…
是固定搭配，表示“不仅……而且……”。主句结构很简单，只是谓语比较多而已（and连
接三个并列的谓语动词）。
托福写作例句6
Spending a lot of time watching sports is negatively affecting many people’s lives because it reduces the quality of the time(that)they spend with their family,keeps them from doing more productive work at home,and also leaves them with less time to volunteer in their communities.
句子结构：本句是由because连接的主从复合句。主句主语是个动名词短语（划线部分）。Because引导原因状语从句，负责解释主句现象产生的原因。在该从句中，time后面省略了一个连接词that，此处that引导定语从句修饰time。