Unit 1 Grammar Study Sheet A sentence is a group of words that tells a complete idea. A sentence begins with a capital letter and ends with a period (.). I went to the park. The subject of a sentence tells who or what does something. The astronaut went to the moon. The predicate of a sentence tells who or what the subject of a sentence does or is. We drive to the woods. A statement is a sentence that tells something. A statement ends with a period (.). The desert is a very hot place. A question is a sentence that asks something. A question ends with a question mark (?). Does the desert have quicksand? A command is a sentence that tells someone to do something. A command ends with a period (.). Clean your room. An exclamation is a sentence that shows surprise or shows strong feelings. An exclamation ends with an exclamation point (!). Ouch! I fell down!