Consider the following premises. For all x, x is curious if and only if x is a taxi driver. For all x, if x were curious, then x is a taxi driver. There is at least one x for which if x were a taxi driver, then x is curious. Can we infer the following from them? There is at least one x for which if x were curious, then x is a taxi driver.
 From the fact that for all x, x is curious if and only if x is a taxi driver we can infer that for all x, if x were a taxi driver, then x is curious. From the fact that there is at least one x for which if x were a taxi driver, then x is curious, and that for all x, if x were curious, then x is a taxi driver we can infer that there is at least one x for which x is a taxi driver if and only if x is curious. Finally, from the fact that there is at least one x for which x is a taxi driver if and only if x is curious we can infer that there is at least one x for which if x were curious, then x is a taxi driver. Therefore, the answer is yes.