Consider the following premises. Sarah is not a cashier. For all x_21, x_21 is a janitor or x_21 is a server. If Sarah were a police officer, then Sarah is a cashier. James is not a janitor. Can we infer the following from them? If we can, name the inference rule being used: If James were a server, then Sarah is not a police officer.
We cannot infer that from the premises. Therefore the answer is no.