Consider the following premises. If David were fast, then it is late. Mary is playing tennis or David is driving a car. For all x_16, x_16 will drive a car if and only if x_16 is fast. If Mary plays tennis, then David is fast. Can we infer the following from them? If we can, name the inference rule being used: It is not cloudy.
We cannot infer that from the premises. Therefore the answer is no.