英语硕士研究生可以用以下几种方式表达：
Master's degree candidate
graduate student for a Master's degree
postgraduate
结合这些表达，一个简洁明了的表述可以是：“I am a Master's degree candidate/graduate student for a Master's degree/postgraduate studying English at [University Name].”
例如：
“I am a Master's degree candidate studying English at Peking University.”
“I am a postgraduate student specializing in English at the University of Oxford.”
这样的表述既符合英语学术环境中的习惯用法，又能清晰地传达个人的学习阶段和所学专业。