Consider the following premises. For all x, if x plays tennis, then x is a nurse. There is at least one x for which x will not play tennis. For all x, if x were a nurse, then x is playing tennis. Can we infer the following from them? If we can, name the inference rule being used: For all x, if x plays tennis, then x is a nurse.
That is one of the premises. Therefore, the answer is yes.