英语句子成分的划分是语法分析的基础，主要依据词汇在句子中的功能和语法关系进行分类。以下是详细的划分方法和示例：

一、主要成分

主语（Subject）

句子的核心成分，表示“是什么”或“谁”。 - 例：

- 名词：Tom

- 代词：He

- 数词：Three

- 动名词/不定式：Swimming, to learn

- 从句：What he needs is... [it作形式主语] [that从句作真正主语] [what从句作直接宾语] [that从句作宾补] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句作定语] [which从句作定语] [that从句作同位语] [who从句