Grammula app for iPhone and iPad

How many tenses are there in English? Is it ‘a’ book or ‘the’ book? Do you know what tense you use for your plan? How do I use passive voice?
You may have heard or asked yourself the questions above. It looks kind of difficult to answer the questions. But wait!
Grammula is the most effective app to understand the core of English grammar. The tables and formulas give you a powerful insight. You will learn the rules of the grammar effortlessly, because it will help you understand the grammar visually and logically. The app based on a visual teaching with easy formulas. Grammula (Grammar + Formula) has been tested by numerous English learners with different language backgrounds. The effect is unbelievable in every English learner who has used Grammula. Some learners who have been learning English for 20 years were stunned by the simplicity of the explanation and tables.

Grammula is the best app to have a firm foundation of understanding the grammar. You will solve your certain grammar problems once and for all.

Grammar
TENSES
TENSES IN DETAIL
PASSIVE VOICE
4 TYPES OF SENTENCES
REPORTED SPEECH
CONDITIONAL
ARTICLE
GAME ONE
GAME TWO