What is the Preposition With? We have already learned that prepositions tell us more about when and where an action is happening in a sentence. We use the preposition with to tell who or what is helping with the action. For example, I went to the store with John. Older students may also use the preposition with when describing how an action is done. This requires using abstract nouns, such as joy, happiness, or anger. For example, She completed her homework with enthusiasm. Here is a video to re