Students will be able to identify and use prepositions to write complete sentences.
Write a sentence on the board that is missing a preposition (i.e. The dog sits the table.)
Ask students what is wrong with the sentence (e.g. it's missing a word; it doesn't make sense).
Explain that, in this sentence, it is unclear how the dog and the table are related to one another.
Draw a picture of a dog under a table, and ask the students to use the picture to decide what word should be added to the sentence to make it more clear.
Invite a student to come up to the board and rewrite the correct sentence (i.e. The dog sits under the table.)
Underline the word under in the new sentence and explain that this word is a preposition. A preposition is a word that expresses the relationship between a noun and another word. In this case, the preposition tells us the dog's position in relation to the table.