I am going to Dubai. The gift is inside the bag. Ali threw a stone into the river. In the above sentences, the underline word creates a relation so these words are prepositions. Example sentences of preposition: The girls go to school. She jumped over the wall. The glass is by the window. He slept under the open sky. Ali was late because of missing the train. Ali was at home Ali was sitting under the tree. He came by the school in a big hurry. Be careful with the glasses. Where are you from ? In the above sentences, all the underlined words show a relationship of a noun with the other words of a sentence. So all these underlines words are prepositions. Types of prepositions: There are some basic types of prepositions. Preposition of time. Preposition of place or direction. Preposition of agents or things. Phrasal preposition. Preposition of time: The preposition of time is that type of preposition which shows the relationship of time with a noun or a pronoun