Consider the following premises. David is drinking water or Joseph is a writer. Joseph is an office clerk. Elisabeth is making tea. If David drinks water, then Joseph is not an office clerk. Can we infer the following from them? Joseph is a writer and Elisabeth is making tea.
 From the fact that if David drinks water, then Joseph is not an office clerk, and that Joseph is an office clerk we can infer that David is not drinking water. From the fact that David is drinking water or Joseph is a writer, and that David is not drinking water we can infer that Joseph is a writer. Finally, from the fact that Joseph is a writer, and that Elisabeth is making tea we can infer that Joseph is a writer and Elisabeth is making tea. Therefore, the answer is yes.