Consider the following premises. For all y, y will make tea if and only if y is a doctor. For all y, y will make tea or y is not a doctor. Can we infer the following from them? For all y, if y were a doctor, then y is making tea.
 From the fact that for all y, y will make tea if and only if y is a doctor we can infer that for all y, if y makes tea, then y is a doctor. Finally, from the fact that for all y, y will make tea or y is not a doctor we can infer that for all y, if y were a doctor, then y is making tea. Therefore, the answer is yes.