Civil juristic acts refer to the legal acts of citizens or legal persons to establish, modify, and terminate civil rights and civil obligations, including civil juristic acts with a time limit and civil juristic acts with conditions. The conditions attached to a civil juristic act are agreed by the actor to occur in the future Uncertain legal facts. A civil juristic act with a time limit refers to a civil juristic act in which a certain period is agreed in a civil juristic act, and the arrival of that period is a prerequisite for the occurrence, modification, and elimination of the actor's civil rights, obligations.
A said to B, 'If my daughter is transferred to work in another place, I will rent the house to you' are conditional civil legal acts according to the above definition.