九、平行错误

　　1) While we reduce the number of vehicles, the speed of traffic can be increased.

　　While we reduce the number of vehicles, we can increase the speed of traffic.

　　2) Before I selected the new course, my teacher warned me of the difficulty of the course and how long it lasted.

　　Before I selected the new course, my teacher warned me of the difficulty and length of the course. / Before I selected the new course, my teacher warned me how difficult the course was and how long it lasted.

　　十、搭配错误

　　1) In the past the price of meat was so expensive that most families could not afford it.

　　In the past the price of meat was so high that most families could not afford it.

　　2) Crowded traffic in some large cities is a big problem for city dwellers.

　　Heavy traffic in some large cities is a big problem for city dwellers.

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