自愿订购英语资料怎么说

如果你想表示自愿订购英语资料，你可以说：
"I would like to voluntarily subscribe to English materials."
"I'm interested in subscribing to English materials on a voluntary basis."
"I'm willing to subscribe to English materials of my own accord."
这些都是可以用来表达自愿订购英语资料的常用表达方式。