Consider the following premises. For all x_1, x_1 is a taxi driver. There is at least one x_1 for which x_1 is not a taxi driver or x_1 is sad. Can we infer the following from them? There is at least one x_1 for which x_1 will cook or x_1 is sad.
 From the fact that for all x_1, x_1 is a taxi driver we can infer that for all x_1, x_1 is a taxi driver or x_1 will cook. Finally, from the fact that for all x_1, x_1 is a taxi driver or x_1 will cook, and that there is at least one x_1 for which x_1 is not a taxi driver or x_1 is sad we can infer that there is at least one x_1 for which x_1 will cook or x_1 is sad. Therefore, the answer is yes.