Consider the following premises. For all x_1, x_1 will drink water. For all x_1, if x_1 drinks water, then x_1 is listening to a song. Can we infer the following from them? If we can, name the inference rule being used: For all x_1, x_1 will listen to a song or x_1 will take a plane.
 From the fact that for all x_1, if x_1 drinks water, then x_1 is listening to a song, and that for all x_1, x_1 will drink water we can infer that for all x_1, x_1 will listen to a song via universal modus ponens. Finally, from the fact that for all x_1, x_1 will listen to a song we can infer that for all x_1, x_1 will listen to a song or x_1 will take a plane via universal addition. Therefore, the answer is yes.