He tried to talk his friend into joining the club.

talk 在这里是动词，意思是"谈话、交谈"，但在这个短语中特指"说服"的尝试。 into 是介词，本义是"进入...里面"，在这里与 talk 搭配构成短语 talk sb into doing sth，表示"说服某人做某事"。 talk sb into doing sth 是一个固定搭配，意思是"说服某人做某事"，强调通过言语劝说让对方改变主意。