状语从句引导词后面第一个词是代词或者名词，就可以判断引导词后面是完整的句子了吧？
我主要是对文章进行改动。比如：Ultrasound technology courses are offered on a variety of specialized subjects for professionals who are looking to maintain their certification or gain additional knowledge and skills.
这里引导词是for ，如果后面是完整的句子那我就会： for professionals who are looking to maintain their certification or gain additional knowledge and skills ultrasound technology courses are offered on a variety of specialized subjects.
这样调换
主要是快速的判定出for后面 是否是完整的句子。