A sentence is a group full of words that have different subjects. There are three types of sentences, these include complex, compound and simple. A sentence needs to include a capital letter in the beginning with a full stop at the end. The purpose of a sentence is to discuss the idea or a subject of the paragraph. This screenshot shows our learning with sentences and their structure we gained lots of knowledge from this site. Please leave some feedback so we can help move our learning to the next level!