When used as an objective pronoun, "nous" is "we"..
eg. Nous jouons au foot. = We play football..
When used as a direct object pronoun, "nous" is "us". Note it is used befo…re the verb..
eg. Ils nous aiment. = They love us..
It can also be used as an indirect object pronoun, ie. "to us", and are used to replace indirect noun objects. They can refer to people or things and are indirectly affected by the action of the verb..
eg. Il nous a montrÃ© la photo. = He showed (to) us the photo. (MORE)