Consider the following premises. It is overcast. If Elisabeth were a server, then it is raining. If it rains, then Elisabeth is drinking water. If it is overcast, then Elisabeth is drinking water. Can we infer the following from them? Elisabeth is drinking water.
 From the fact that it is overcast we can infer that it is overcast or Elisabeth is a server. From the fact that if Elisabeth were a server, then it is raining, and that if it rains, then Elisabeth is drinking water we can infer that if Elisabeth were a server, then Elisabeth is drinking water. Finally, from the fact that if it is overcast, then Elisabeth is drinking water, that if Elisabeth were a server, then Elisabeth is drinking water, and that it is overcast or Elisabeth is a server we can infer that Elisabeth is drinking water. Therefore, the answer is yes.