Consider the following premises. Jennifer is a writer or Elisabeth is not drinking water. If Jennifer were a writer, then Karen is an electrician. Joseph is playing tennis if and only if Karen is an electrician. Can we infer the following from them? If Elisabeth drinks water, then Joseph is playing tennis.
 From the fact that Jennifer is a writer or Elisabeth is not drinking water we can infer that if Elisabeth drinks water, then Jennifer is a writer. From the fact that Joseph is playing tennis if and only if Karen is an electrician we can infer that if Karen were an electrician, then Joseph is playing tennis. From the fact that if Elisabeth drinks water, then Jennifer is a writer, and that if Jennifer were a writer, then Karen is an electrician we can infer that if Elisabeth drinks water, then Karen is an electrician. Finally, from the fact that if Elisabeth drinks water, then Karen is an electrician, and that if Karen were an electrician, then Joseph is playing tennis we can infer that if Elisabeth drinks water, then Joseph is playing tennis. Therefore, the answer is yes.