Consider the following premises. If Susan plays tennis, then Richard is poor. If Susan plays tennis, then Jennifer is a taxi driver. If Richard were poor, then Susan is playing tennis. Can we infer the following from them? If Richard were poor, then Jennifer is a taxi driver.
 From the fact that if Richard were poor, then Susan is playing tennis, and that if Susan plays tennis, then Richard is poor we can infer that Richard is poor if and only if Susan is playing tennis. From the fact that Richard is poor if and only if Susan is playing tennis we can infer that if Richard were poor, then Susan is playing tennis. Finally, from the fact that if Richard were poor, then Susan is playing tennis, and that if Susan plays tennis, then Jennifer is a taxi driver we can infer that if Richard were poor, then Jennifer is a taxi driver. Therefore, the answer is yes.