原句：When you come to the second traffic light, turn right.
修改后：At the second traffic light turn left.
策略之二：删除诸如"who is”或"that is"之类的关系代词，变从句为短语。例：
原句：The novel, which is written in three parts, told a story that took place in the Middle Ages.
修改后：The three-part novel told a story set in the Middle Ages.
注：把句中的"three parts"改用形容词来表达，节省了四个不必要的单词"which is written in"。我们经常可以将关系代词如"that"去掉，这只会引起最少的变动。