Every sentence has two essential parts: a subject (who or what the sentence is about) and a predicate (what the subject does or is). A complete sentence expresses a complete thought.

The eight parts of speech are nouns, pronouns, verbs, adjectives, adverbs, prepositions, conjunctions, and interjections. Understanding these helps you construct clear, correct sentences.

Proper punctuation helps readers understand your writing. Periods end statements, question marks end questions, and exclamation marks show strong feeling. Commas separate items in a list, join independent clauses with conjunctions, and set off introductory elements.

Subject-verb agreement means the verb must match the subject in number: "The dog runs" (singular) vs. "The dogs run" (plural).