Consider the following premises. For all x_9, x_9 is curious if and only if x_9 will play tennis. There is at least one x_9 for which x_9 is curious if and only if x_9 will play tennis. Can we infer the following from them? For all x_9, if is not true that x_9 is curious if and only if x_9 will play tennis.
That contradicts the premises. Therefore the answer is no.