Consider the following premises. If Susan works, then it is snowing. It is not snowing. Susan is working or John is not an astronaut. Can we infer the following from them? John is an astronaut.
 From the fact that Susan is working or John is not an astronaut we can infer that if John were an astronaut, then Susan is working. From the fact that if John were an astronaut, then Susan is working, and that if Susan works, then it is snowing we can infer that if John were an astronaut, then it is snowing. Finally, from the fact that if John were an astronaut, then it is snowing, and that it is not snowing we can infer that John is not an astronaut, which contradicts that John is an astronaut. Therefore, the answer is no.