Consider the following premises. For all x, x is not an artist. For all x_5, if x_5 writes a letter, then x_5 is making tea. For all x, x is an artist or x will write a letter. Can we infer the following from them? David is not making tea.
 From the fact that for all x, x is an artist or x will write a letter, and that for all x, x is not an artist we can infer that for all x, x will write a letter. From the fact that for all x, x will write a letter we can infer that David is writing a letter. From the fact that for all x_5, if x_5 writes a letter, then x_5 is making tea we can infer that if David writes a letter, then David is making tea. Finally, from the fact that if David writes a letter, then David is making tea, and that David is writing a letter we can infer that David is making tea, which contradicts that David is not making tea. Therefore, the answer is no.