One of the site’s most iconic features is its quick-reference system. Important grammar rules are often highlighted in yellow boxes, and comprehensive tables allow students to quickly look up irregular verbs or adjective endings without wading through paragraphs of text.
Since you said "make a feature," I'll assume you want me to that could be added to English Hilfen to improve the learning experience.
Access word lists, useful phrases, idioms, and sample letters that help transition from textbook learning to real-world application.
Fun ways to test and expand your active vocabulary.
English Hilfen: A Complete Guide to Mastering English Online
Allow users to generate a from a previous one they struggled with — by remixing the same grammar rule or vocabulary set with different sentences.