Consider the following premises. For all x_16, if x_16 were a writer, then x_16 is a server. For all x_16, if x_16 were poor, then x_16 is working. For all x_16, x_16 is a server if and only if x_16 is poor. If David works, then Sarah is drinking water. Can we infer the following from them? If we can, name the inference rule being used: David is working.
We cannot infer that from the premises. Therefore the answer is no.