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托福寫作中標點符號的使用講解
托福 寫作技巧1：在并列連詞(and，but，for，nor，or，yet )前使用，用來連接句中的各分句。
　　The principal reason for this is that none of them possesses chlorophyll，andsince they cannot synthesize their own carbohydrates，they obtain their supplies either from the breakdown of dead organic matter or from other living organisms.
　　托福寫作技巧2：用逗號來分隔一系列單詞、詞組和從句。
　　Furthermore the walls of fungal cells are not made of cellulose，as those of plants are，but of another complex sugarlike polymer called chitin，the material from which the hard outer skeletons of shrimps，spiders，and insects are made.
　　They are a major cause of structural damage to building timbers，a cause of disease in animals and humans，and one of the greatest causes of agricultural losses.
　　新托福寫作技巧3：逗號用來分隔與句子其他部分密切相連的簡短插入語或旁白。(較長的，更為突兀的或復(fù)雜的插入成分的則用破折號或圓括號。)
　　Chemical fertilization，for example，helps to produce better crops，but is harmful to the environment.
　　新托福寫作技巧4：在并列形容詞，即分別修飾同一個名詞的形容詞之間使用逗號，但也有的形容詞之間不加逗號的。
　　For men，heroism was usually described as bravery and the active，successfulovercoming of adversity.
　　新托福寫作技巧5： 用逗號來分隔非限定性修飾語，即該修飾語對于句子的意義并非必不可少。非限定性修飾語與限定性修飾語的區(qū)別在于，它即使被省略，也不會改變句子的主要意思。
　　(1) 同位語。
　　The canopy，the upper level of the trees in the rain forest，holds a plethora of climbing mammals of moderately large size，which may include monkeys，cats，civets，and porcupines.
　　(2) 從句。
　　The canopy，the upper level of the trees in the rain forest，holds a plethora of climbing mammals of moderately large size，which may include monkeys，cats，civets，and porcupines.