Consider the following premises. There is at least one x for which x will drink water or x will play tennis. For all x, if x goes running, then x is sleeping. For all x, x will not drink water. For all x, x is a scientist or x will go running. For all x, if x were a scientist, then x is sleeping. Can we infer the following from them? For all x, either x will sleep or x will play tennis are not true.
 From the fact that for all x, if x were a scientist, then x is sleeping, that for all x, if x goes running, then x is sleeping, and that for all x, x is a scientist or x will go running we can infer that for all x, x will sleep. From the fact that there is at least one x for which x will drink water or x will play tennis, and that for all x, x will not drink water we can infer that there is at least one x for which x will play tennis. Finally, from the fact that for all x, x will sleep, and that there is at least one x for which x will play tennis we can infer that there is at least one x for which x will sleep and x will play tennis, which contradicts that For all x, either x will sleep or x will play tennis are not true. Therefore, the answer is no.