句子剖析

The fastest and easiest way is to model the style of someone in person, on the phone, and by email.

in person, on the phone, and by email.这几组介词是干什么状语，表达的意思是？

红色的三个介词短语都是不定式to model的方法状语。分别为亲自、本人，通过电话，通过邮件。