"学术英语就该多用被动"——这是很多中国学生被反复灌输、却越用越别扭的一条"铁律"。结果写出来的句子满是"it was found that""the data were collected",读起来像机器翻译。被动语态在学术英语里确有正当位置,但把它当万能公式,反而会让你的写作又僵又空。学会取舍,是学术英语进阶的第一道坎。
另一个容易被忽视的问题是"被动嵌套"。一个句子里套两层被动,读者要绕三圈才读懂谁对谁做了什么。比如"it was observed that a correlation was found between A and B",不如直接写"we found a correlation between A and B"。能用一层说清的,绝不用两层;能主动说清的,绝不绕被动。