介词for后面跟什么

名词或代词：例如，"I bought a gift for my friend."

动名词：例如，"I am looking for a job."

名词性短语：例如，"This is a good book for beginners."

句子：例如，"He is famous for his paintings."

需要注意的是，介词 "for" 的具体用法和含义会根据上下文和语境而有所不同。