Fourth graders typically learn about the different types of sentences, identifying types of words used in sentences and using coordinating conjunctions. Fourth grade curriculum usually includes significant review of basic concepts, since it's the point when children begin using more advanced grammar.
The four types of sentences are declarative, interrogative, imperative and exclamatory. Declarative sentences state something. Interrogative sentences ask questions. Imperative sentences command or request something, and exclamatory sentences state a strong feeling. Declarative and imperative sentences both end with periods, interrogative sentences end with question marks and exclamatory sentences end with an exclamation point.
Fourth graders learn the parts of speech, including nouns, adjectives and verbs. A noun is a person, place or thing. Adjectives describe other words. Verbs describe an action being performed, but there are multiple types of verbs, including action and helping verbs. Students learn how to identify these different types of words in sentences.
Fourth graders learn the difference between complete sentences and fragments, which are incomplete sentences. They also learn how to create sentences with multiple parts using coordinating conjunctions. Coordinating conjunctions, such as the words "for," "but" and "yet," join multiple ideas into one sentence using a comma before the conjunction. When one of these words is used, it also requires another subject. The subject and verb can be the same for each part of the sentence.