指标

句法结构单位功能

示例(选自学生作文)

子句平均长度(MLC)

带主语和限定动词，包括独立子句、形容词、副词和名词子句

As we all know, learning a new skill is difficult and tough. (子句数量为2，子句长度分别为4和8)

句子平均长度(MLS)

以句号、问号、感叹号隔开的一组词

But in past few years, I had no time reading because of too much homework. (句子数量为1，句子长度为15)

T单位平均长度(MLT)

一个T单位由一个主句和任何从属子句或附着或嵌入在主句中的非子句结构

I'm willing to share my feelings to you about this. (T单位数量为1，T单位长度为10)

T单位中从句数量(DC/T)

从句指限定名词、副词和形容词从句

Undoubtedly, it is a valuable skill which added a spice to my life. (T单位数量为1，从句数量为1，DC/T = 1)

子句中并列短语数量(CP/C)

并列短语包括并列形容词、副词、名词和动词短语

The shop assistant is really kind and helpful. (并列短语为1，子句1，CP/C = 1)

句子中T单位数量(T/S)

一个T单位由一个主句和任何从属子句或附着或嵌入在主句中的非子句结构

I begin to learn how to take photos and I have a big interest in it. (T单位数量为2，句子数量为1，T/S = 2)

子句中复杂名词数量(CN/C)

复杂名词短语包括：带修饰成分的名词；名词性从句；动名词或不定式做主语

To my surprise, everyone gave good reviews and I felt so proud of myself. (子句数量为2，复杂名词短语为1，CN/C = 0.5)