1. Provide users with full-scale ways to English infinitive, allow users to have a good many built-in sentences for each grammar point, and maintain their own classical sentences which are editable during study.
2.Provide users with a lot of exercises with detailed answers,make users fully master the grammar point, and maintain their own classical exercises which are editable during study.
3.Checking the histories of study make users review their weak points and deepen their memories of the difficult grammar points.
4.This app itself is a studying framework of English infinitive, allowing users to record, study, and edit anywhere and anytime.