Consider the following premises. For all x_14, if x_14 were a sailor, then x_14 is a doctor. If it is late, then William is not a doctor. William is a sailor. Can we infer the following from them? It is not late.
 From the fact that for all x_14, if x_14 were a sailor, then x_14 is a doctor we can infer that if William were a sailor, then William is a doctor. From the fact that if William were a sailor, then William is a doctor, and that William is a sailor we can infer that William is a doctor. Finally, from the fact that if it is late, then William is not a doctor, and that William is a doctor we can infer that it is not late. Therefore, the answer is yes.