Consider the following premises. For all z, z is a musician or z will not drink water. For all z, z will drink water or z is not a musician. Can we infer the following from them? If Linda were a musician, then Linda is drinking water.
 From the fact that for all z, z will drink water or z is not a musician we can infer that for all z, if z were a musician, then z is drinking water. From the fact that for all z, z is a musician or z will not drink water we can infer that for all z, if z drinks water, then z is a musician. From the fact that for all z, if z were a musician, then z is drinking water, and that for all z, if z drinks water, then z is a musician we can infer that for all z, z is a musician if and only if z will drink water. From the fact that for all z, z is a musician if and only if z will drink water we can infer that Linda is a musician if and only if Linda is drinking water. Finally, from the fact that Linda is a musician if and only if Linda is drinking water we can infer that if Linda were a musician, then Linda is drinking water. Therefore, the answer is yes.