Consider the following premises. For all x_3, if x_3 were sad, then x_3 is making tea. For all x_3, if x_3 makes tea, then x_3 is not driving a car. For all x_3, if x_3 makes tea, then x_3 is sad. For all x_3, x_3 will drive a car. Can we infer the following from them? For all x_3, x_3 is not sad.
 From the fact that for all x_3, if x_3 makes tea, then x_3 is not driving a car, and that for all x_3, x_3 will drive a car we can infer that for all x_3, x_3 will not make tea. From the fact that for all x_3, if x_3 makes tea, then x_3 is sad, and that for all x_3, if x_3 were sad, then x_3 is making tea we can infer that for all x_3, x_3 will make tea if and only if x_3 is sad. Finally, from the fact that for all x_3, x_3 will make tea if and only if x_3 is sad, and that for all x_3, x_3 will not make tea we can infer that for all x_3, x_3 is not sad. Therefore, the answer is yes.