Consider the following premises. For all y_3, y_3 is poor or y_3 will drink water. If Linda drinks water, then it is raining. Linda is taking a plane if and only if it is raining. For all y_3, y_3 is not poor or y_3 will take a plane. Can we infer the following from them? It is not raining.
 From the fact that for all y_3, y_3 is poor or y_3 will drink water, and that for all y_3, y_3 is not poor or y_3 will take a plane we can infer that for all y_3, y_3 will drink water or y_3 will take a plane. From the fact that for all y_3, y_3 will drink water or y_3 will take a plane we can infer that Linda is drinking water or Linda is taking a plane. From the fact that Linda is taking a plane if and only if it is raining we can infer that if Linda takes a plane, then it is raining. Finally, from the fact that if Linda drinks water, then it is raining, that if Linda takes a plane, then it is raining, and that Linda is drinking water or Linda is taking a plane we can infer that it is raining, which contradicts that It is not raining. Therefore, the answer is no.