Consider the following premises. If it is windy, then Richard is curious. If Richard were curious, then it is sunny. It is windy or William is not climbing a mountain. Can we infer the following from them? If William climbs a mountain, then it is sunny.
 From the fact that it is windy or William is not climbing a mountain we can infer that if William climbs a mountain, then it is windy. From the fact that if William climbs a mountain, then it is windy, and that if it is windy, then Richard is curious we can infer that if William climbs a mountain, then Richard is curious. Finally, from the fact that if William climbs a mountain, then Richard is curious, and that if Richard were curious, then it is sunny we can infer that if William climbs a mountain, then it is sunny. Therefore, the answer is yes.