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