There are many different grammar topics that can be covered in a fifth grade class. Common topics include parts of speech (nouns, verbs, adjectives, adverbs), proper sentence structure, and punctuation. Other potential topics include homophones, homographs, and homonyms; prefixes, suffixes, and root words; and irregular verbs. Some teachers may also choose to introduce students to more advanced concepts such as gerunds, participles, and infinitives. The best way to determine which grammar topics will be covered in a particular fifth grade class is to consult the curriculum or ask the teacher.