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Workflow patterns contain basic features of business process. How to implement these patterns depends on the modeling languages and methods. Pi-calculus, as a kind of process algebra, can be applied in business process modeling. This paper uses Pi-calculus, as a formalizing utility, to investigate some workflow patterns that may have multiple presentation versions with BPMN. The main goal is to explore expressive capabilities of Pi-calculus regarding business process and check representations of workflow patterns in Pi-calculus.