Automated software engineering has attracted a large amount of research efforts. The use of object-oriented methodologies for software systems development has made it necessary to develop approaches that automate the construction of different UML models in a semi-automated approach from textual user requirements. UML use case models represent an essential artifact that provide a perspective of the system under analysis or development The development of such use case models is very crucial in an object-oriented development methodology. The main principles used in obtaining these models are described. A natural language processing tool is used to parse different statements of the user requirements written in Arabic to obtain lists of nouns, noun phrases, verbs, verb phrases, etc. that aid in finding potential actors and use cases. A set of steps that represent our approach for constructing a use case model is presented. Finally, the proposed approach is validated using an experiment involving a group of graduate students who are familiar with use case modeling.