Consider the following premises. For all y_1, y_1 will read a book. For all z_3, z_3 is curious. For all z_3, z_3 is curious if and only if z_3 will cook. Can we infer the following from them? Thomas is reading a book and David is cooking.
 From the fact that for all z_3, z_3 is curious if and only if z_3 will cook we can infer that for all z_3, if z_3 were curious, then z_3 is cooking. From the fact that for all z_3, if z_3 were curious, then z_3 is cooking, and that for all z_3, z_3 is curious we can infer that for all z_3, z_3 will cook. From the fact that for all y_1, y_1 will read a book we can infer that Thomas is reading a book. From the fact that for all z_3, z_3 will cook we can infer that David is cooking. Finally, from the fact that Thomas is reading a book, and that David is cooking we can infer that Thomas is reading a book and David is cooking. Therefore, the answer is yes.