English grammar app contains following grammar concepts
Basic eight parts of English grammar
Noun
Pronoun
Adjective
Verb
Adverb
Verb Forms
Subjects and Objects
Tenses
Simple Present Tense
Simple Past Tense
Simple Future Tense
Present continuous tense
Past continuous tense
Future continuous tense
Present Perfect Tense
Past Perfect Tense
Future Perfect Tense
Present Perfect Continuous Tense
Past Perfect Continuous Tense
Future Perfect Continuous Tense
Auxiliary Verb
Modal Auxiliary Verbs
Prepositions
Conjunctions
Interjections
Types of Sentense
Articles
Phrase
Active and Passive Voice
Determiners
The Definite Article
Indefinite Articles
Demonstratives
Pronouns
Qunantifiers
Distributives
Determiners of Difference
Pre-Determiners
Yes/no questions
Wh-questions
Tag questions
Clauses
Conditionals