Используйте приложение APKPure
Историческую версию Chinese grammar можно получить на Android
собирает все правила китайской грамматики и грамматический тест для начинающих
Chinese grammar is FREE application.
The application contain many test question, very useful to understand the grammar.
This app helps you to learn the grammar of Chinese languages in a very easy and effective way.
All the topics in this app are covered in depth and in a most simple way.