The man who I served was wearing a hat.这是一个定语从句，请问定语从句有什么句序公式吗?

你总结的公式应该是对的。
noun/pron.+Attributive clause（定语从句）
名词/人称代词+定语从句

定语从句的定义:补充限制性定语从句后原句才完整,以修饰静态事物为特征. that=who/whom/which=主语=宾语.

?比如 He is the man who/whom/that I met. 他就是我遇到的那个人.*who/whom/that=宾语

??This is the phone which/that I took.这就是我拍的照片. ? *that=who/whom/which=宾语时可省略

? *that≠to whom/in which介词宾语(但无介词限制时可使用.*限制性定语从句的非正式文体可省略)。

? He is the man to whom I gave the money. ?? ????? ?他就是我给他钱的那个人。

? He is the man who/whom/that I gave the money to. ?? ??他就是我给他钱的那个人。

? He is the man I gave the money to. (省略)?? ?? ??? 他就是我给他钱的那个人。

引导词—which ?who ?whom ?whose ?as ?where ?when? why ?that ?to/from~whom

? ?? about/for/by/in/on/with/without~which ...

1.The person to whom I spoke just now is our headmaster. 我刚才同那位说话者是我们的校长。

2.That is the reason why(=for which) we must go now.? ?那就是我们现在为什么必须走的原因。

3.That is the place where(=in which) we lived.? ????那就是我们住过的地