平行結構

　　1.注意由并列連詞或等立連詞連接的成分在語法形式上是否相同，即都是形容詞，或都是介詞短語，或都是不定式，或都是動名詞，或都是句子等。如：

　　Symposium talks will cover a wide range of subjects from overfishing to physical and environmental factors that affect the populations of different species.

　　In the teaching of mathematics, the way of instruction is generally traditional, with teachers presenting formal lectures and students taking notes.

　　2.注意比較結構中相比較的內(nèi)容在語法形式上是否相同。如：

　　It is better to die on one’s feet than to live on one’s knees.

　　Despite the temporary difficulties, the manager prefers increasing the output to decreasing it.

　　3.其他具有并列或比較意義的短語。

　　(1)rather than, let alone 雖不是并列連詞，但在結構上連接兩個語法形式相同的成分。如：

　　We are taught that a business letter should be written in a formal style rather than in a personal style.

　　For the new country to survive, let alone for its people to enjoy prosperity, new economic policies will be required.

　　(2)如果平行的兩個成分在形式上是介詞短語，而且介詞相同，一般說來第二個介詞不要省略。如：

　　At times, more care goes into the composition of newspaper and magazine advertisements than into the writing of the features and editorials.