The term 'belonging to us' can be expressed in two ways: OUR and OURS. OUR is a three-letter word that is used as a possessive pronoun to refer to a group or a single person. It is often used to indicate ownership or possession of something. OURS is a four-letter word that is also a possessive pronoun, but it is used to refer to a group of people. Both words are used to express the idea of something belonging to a group or a single person.