Consider the following premises. There is at least one x_4 for which x_4 is a mechanic or x_4 will drink water. For all x_4, x_4 is not a mechanic. For all x_4, x_4 will listen to a song. Can we infer the following from them? There is at least one x_4 for which x_4 will drink water and x_4 will listen to a song.
 From the fact that there is at least one x_4 for which x_4 is a mechanic or x_4 will drink water, and that for all x_4, x_4 is not a mechanic we can infer that there is at least one x_4 for which x_4 will drink water. Finally, from the fact that there is at least one x_4 for which x_4 will drink water, and that for all x_4, x_4 will listen to a song we can infer that there is at least one x_4 for which x_4 will drink water and x_4 will listen to a song. Therefore, the answer is yes.