The contents of this app are: 1. Noun 2. Pronouns 3. Adjective 4. Verb 5. Adverb 6. Preposition 7. Conjunction 8. Interjection 9. Singular and plural 10. Tenses 11. Definite Article 12. Indefinite Article 13. Clause 14. Concord 15. Gender 16. Punctuation 17. Letter writing 18. Figures of speech 19. Idioms 20. Essay 21. Summary 22. Comprehension 23. Persons 24. Prefix and Suffix 25. Possessive 's' 26. Regular and Irregular verbs 27. Direct and Indirect speech 28. Active and passive voice 29. Conditional Sentences 30. Questions tags 31. Common Mistakes in English