Consider the following premises. There is at least one x_11 for which if x_11 drinks water, then x_11 is playing squash. For all x_11, if x_11 plays squash, then x_11 is drinking water. For all x_11, x_11 will not drive a car. For all x_11, x_11 will drive a car or x_11 will play squash. Can we infer the following from them? There is at least one x_11 for which x_11 will drink water.
 From the fact that for all x_11, if x_11 plays squash, then x_11 is drinking water, and that there is at least one x_11 for which if x_11 drinks water, then x_11 is playing squash we can infer that there is at least one x_11 for which x_11 will play squash if and only if x_11 will drink water. From the fact that there is at least one x_11 for which x_11 will play squash if and only if x_11 will drink water we can infer that there is at least one x_11 for which if x_11 plays squash, then x_11 is drinking water. From the fact that for all x_11, x_11 will drive a car or x_11 will play squash, and that for all x_11, x_11 will not drive a car we can infer that for all x_11, x_11 will play squash. Finally, from the fact that there is at least one x_11 for which if x_11 plays squash, then x_11 is drinking water, and that for all x_11, x_11 will play squash we can infer that there is at least one x_11 for which x_11 will drink water. Therefore, the answer is yes.