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Grammar is also a body of instructions that can be studied in schools. (See What is Grammar?) Grammar examines how words or morphemes combine to form meaningful sentences. It is a set of constraints on the possible sequences of symbols expressed as rules or principles. Syntax is the basic ingredient of grammar. Grammar tells us the difference between sets of sentences. We can identify five basic units of grammatical structure. These are: morphemes, word, phrase, clause and sentence. There are posts dedicated to each of these 5 aspects. See them here:
1
What is a morpheme?
2
Parts of Speech
3
Phrase/Groups in English
4
The English Clause
5
The English Sentence
6
Types of Sentence according to Function
7
Types of Sentences according to Structure
1
What is A Morpheme?
Types of Morphemes: Free and Bound 
Prefix
Bound Morphemes
Suffix
Derivational and Inflectional Morphemes: Differences 
2
Parts of Speech
Nouns
Verbs
Adverbs
Adjectives
Prepositions
Prepositional complement
Conjunctions
Interjections
Articles
Pronouns
Prepositional objects
3
Phrase/Groups in English
Nominal Group
Verbal Group
Adjectival group (See Adjectival clause).
Adverbial Group
Prepositional Group
4
The English Clause
The Noun/Nominal Clause
The Relative Clause or Adjectival Clause
The Adverbial Clause
Types of Clauses
Types of Sentence according to Function
Types of Sentences according to Structure
Patterns of the English Sentence
Patterns of the English Simple Sentence
The Simple Sentence: Definitions and Constituents.
The Syntactic Elements of the Clause Structure
Voice in English
Tense in English
Misuse Commas
Punctuation Marks
1. Apostrophe (‘)
2. Caret (^)
3. Colon (:)
4. Comma (,)
5. Ellipsis (…)
6. Dash – Em dash (—), En dash (–)
7. Exclamation mark (!)
8. Full Stop or Period (.)
9. Hyphen (-)
10. Inverted Commas or Quotation marks (“)
11. Parentheses, Braces or Square Brackets () {} []
12. Question mark (?)
13. Semicolon (;)
14.  Slash (/)
Types of Questions
Tag Questions
Wh Questions
Order of Adjectives
Minor Sentence
Coordinator
Subordination and Coordination
Appositions