语法知识点贯穿英语各类题型，所以语法基础要打好，重点语法要熟练掌握。新东方在线总结写作部分常见语法错误，大家要注意：
2019考研英语写作常见语法错误：指代关系不清楚
例1：
a) Sometimes teachers will inform students of the heavy burden theyhave to bear.
b) Sometimes a teacher will inform students of the heavy burden he has to bear.
分析：they 既可指代teachers, 也可指代 students，明显的是指代不清。其实只要把其中一个名词变成单数，用he和 they分别代不同的名词，就清楚了。因为 a teacher也可泛指所有教师。
例2：
a) Someone believes that the teacher's task is to give students knowledge, which may not be true.
b) Someone believes that the teacher's task is to give students knowledge, a notion which may not be true.
分析：which指代什么不清楚，指 knowledge，还是指前面整个句子?如果指 Someone believes，最好用 a notion或an idea归纳一下整个句子的意思，然后引出从句。
例3：
a) People have been fighting against the influence of TV commercials, but it often proves useless.
b) People have been fighting against the influence of TV commercials, but the effort often proves useless.
分析：it 指什么?如指influence，则在 it often proves useless 这个句子中显然不通。写作人知道it指人们的努力，但effort 这个词前面没有出现过，就不能用it。