在句子'约翰为自己买了礼物'中，'自己'是一个回指词，指代'约翰'。

In the sentence 'John bought a gift for ___himself', '___himself' is an ___anaphor referring back to 'John'.

校长本人亲自来参加我们的毕业典礼。

The principal ___himself came to attend our graduation ceremony.

他自己完成了这个项目，没有寻求任何帮助。

He finished the project ___himself without asking for any help.