4．表示相同的意思，是否用了平行语法结构

a) With the computer, one can do shopping, banking and read at home.

b) With the computer, one can do shopping, banking and reading at home.

can do shopping, banking and read at home, 用语法平行结构来衡量，用动词原形 read是不妥的，为了和 do shopping, do banking 保持结构上平行，接下来的一个内容要用do reading。

a) Nowadays, people not only eat enough food, but also eat better.

b) Nowadays, people not only eat more, but also eat better.

用 not only...but also…, both...and…, whether...or…, either...or…, as well as, along with等能连接两个成分的连词，前后两个成分在结构上要保持一致。用 eat enough food和eat better，不如用 eat more和eat better，都用副词。

a) Participating in sports is good for our physical health, and through it we can also train our character.

b) Participating in sports is good for our physical health, and it is also beneficial to our character-training.

在说同样的事时，相邻的句子尽可能在语法结构上保持一致。

5．用代词时，指代是否清楚

a) Sometimes teachers will inform students of the heavy burden they have to bear.

b) Sometimes a teacher will inform students of the heavy burden he has to bear.

they 即可指代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。

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.

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。

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.

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。