Consider the following premises. Elisabeth is a lawyer. If Robert were a politician, then William is not a scientist. It is late. If it is late, then William is a scientist. Can we infer the following from them? Elisabeth is a lawyer and Robert is not a politician.
 From the fact that if it is late, then William is a scientist, and that it is late we can infer that William is a scientist. From the fact that if Robert were a politician, then William is not a scientist, and that William is a scientist we can infer that Robert is not a politician. Finally, from the fact that Elisabeth is a lawyer, and that Robert is not a politician we can infer that Elisabeth is a lawyer and Robert is not a politician. Therefore, the answer is yes.