The contents of this app are:

Parts of speech
Noun
~Types of nouns
~Proper noun and common noun
~Abstract noun
~Collective noun
~Countable noun
~Uncountable noun
Pronouns
~Personal pronoun
~Possessive pronoun
~Relative pronouns
~Indifinite pronouns
~Demonstrative pronouns
~Interrogative pronouns
Adjective I
~Adjective of quality
~Adjective of quantity
~Adjective of possession
~Demonstrative adjective
~Interrogative adjective
Adjective II
~Adjective with 'ing'
~Adjective with 'ed'
~Comparative adjectives
~Superlative adjectives
Verbs
~Main verbs
~Linking verbs
~Auxiliary verbs
~Auxiliary 'be'
~Auxiliary 'do'
~Auxiliary 'have'
~Modal verbs
~Transitive verb
~Intransitive verb
~Phrasal verbs
Adverb
~Adverb of time or frequency
~Adverb of place or direction
~Adverb of manner
~Adverb of comparison
Preposition
Conjunction
~Coordinating conjunction
~Subordinating Conjunction
~Correlative conjunction
Interjection
Singular and plural
Tenses
~Simple present tense
~Past tense
~Present continuous tense
~Future tense
Definite Article
Indefinite Article
Clause
~Noun clause
~Adverbial clause
~Adjectival clause
Concord
~Subject or verb Concord
Gender
~Masculine gender
~Feminine gender
~Common gender
~Neuter Gender
Punctuation
Letter writing
~Formal letter
~Informal letter
~Semi Formal letter
Figures of speech
~Simile
~Metaphor
~Personification
~Hyperbole
~Metonymy
~Synecdoche
~Irony
~Euphemism
~Paradox
Idioms
Essay
~Exposition essay
~Narrative essay
~Descriptive essay
~Argumentative essay
Summary
~Traditional forms of summary
~Modern forms of summary
Comprehension
Persons
~First person singular
~First person plural
~Second person singular
~Second person plural
~Third person singular
~Third person plural
Prefix and Suffix
Possessive 's'
Regular and Irregular verbs
Direct and Indirect speech
Common Mistakes in English