Consider the following premises. For all x_8, x_8 will drink water if and only if x_8 is a lawyer. For all x_8, x_8 will drink water. Can we infer the following from them? There is at least one z for which z is a lawyer.
 From the fact that for all x_8, x_8 will drink water if and only if x_8 is a lawyer we can infer that for all x_8, if x_8 drinks water, then x_8 is a lawyer. From the fact that for all x_8, if x_8 drinks water, then x_8 is a lawyer, and that for all x_8, x_8 will drink water we can infer that for all x_8, x_8 is a lawyer. From the fact that for all x_8, x_8 is a lawyer we can infer that Linda is a lawyer. Finally, from the fact that Linda is a lawyer we can infer that there is at least one z for which z is a lawyer. Therefore, the answer is yes.