Consider the following premises. For all x_18, x_18 is happy. Jennifer is an astronaut if and only if William is driving a car. Jennifer is not an astronaut. Can we infer the following from them? William is driving a car.
 From the fact that for all x_18, x_18 is happy we can infer that Thomas is happy. Finally, from the fact that Jennifer is an astronaut if and only if William is driving a car, and that Jennifer is not an astronaut we can infer that William is not driving a car, which contradicts that William is driving a car. Therefore, the answer is no.