Consider the following premises. If Sarah were a scientist, then it is cloudy. Patricia is drinking water. If Patricia drinks water, then Sarah is a scientist. If Charles plays squash, then it is not cloudy. Can we infer the following from them? Charles is not playing squash.
 From the fact that if Patricia drinks water, then Sarah is a scientist, and that Patricia is drinking water we can infer that Sarah is a scientist. From the fact that if Sarah were a scientist, then it is cloudy, and that Sarah is a scientist we can infer that it is cloudy. Finally, from the fact that if Charles plays squash, then it is not cloudy, and that it is cloudy we can infer that Charles is not playing squash. Therefore, the answer is yes.