在英语中，从句是复合句的一部分，它有自己的主语和谓语。

要找到从句的主语，首先需要确定从句的类型。英语中有三种主要的从句类型：名词性从句、形容词性从句（定语从句）和副词性从句。

1. 名词性从句：这种从句在句子中起名词的作用，可以作主语、宾语、表语或同位语。例如： - That he won the game surprised us. (主语从句) - I don't know if he will come to the party. (宾语从句) - The problem is when we should start. (表语从句) - The news that he won the prize is true. (同位语从句)

2. 形容词性从句（定语从句）：这种从句修饰一个名词或代词，称为先行词。从句中的主语通常是先行词。例如： - The boy who is wearing a red hat is my friend. (先行词是\