Consider the following premises. There is at least one x_7 for which x_7 is bored. For all x_7, if x_7 were bored, then x_7 is playing tennis. For all x_7, x_7 will play tennis if and only if x_7 will drink water. Can we infer the following from them? There is at least one x_7 for which x_7 will play tennis.
 From the fact that for all x_7, x_7 will play tennis if and only if x_7 will drink water we can infer that for all x_7, if x_7 drinks water, then x_7 is playing tennis. From the fact that there is at least one x_7 for which x_7 is bored we can infer that there is at least one x_7 for which x_7 is bored or x_7 will drink water. Finally, from the fact that for all x_7, if x_7 were bored, then x_7 is playing tennis, that for all x_7, if x_7 drinks water, then x_7 is playing tennis, and that there is at least one x_7 for which x_7 is bored or x_7 will drink water we can infer that there is at least one x_7 for which x_7 will play tennis. Therefore, the answer is yes.