Consider the following premises. Mary is not curious. For all z, if z were a writer, then z is curious. Can we infer the following from them? If we can, name the inference rule being used: Mary is a writer.
 From the fact that for all z, if z were a writer, then z is curious we can infer that if Mary were a writer, then Mary is curious via universal instantiation. Finally, from the fact that if Mary were a writer, then Mary is curious, and that Mary is not curious we can infer that Mary is not a writer via modus tollens, which contradicts that Mary is a writer. Therefore, the answer is no.