Consider the following premises. For all x, if x were a server, then x is making tea. There is at least one x for which x will play tennis if and only if x will make tea. Can we infer the following from them? There is at least one x for which if x were a server, then x is playing tennis.
 From the fact that there is at least one x for which x will play tennis if and only if x will make tea we can infer that there is at least one x for which if x makes tea, then x is playing tennis. Finally, from the fact that for all x, if x were a server, then x is making tea, and that there is at least one x for which if x makes tea, then x is playing tennis we can infer that there is at least one x for which if x were a server, then x is playing tennis. Therefore, the answer is yes.