Consider the following premises. There is at least one y for which y will take a plane. For all y, y is fast. For all y, y is a poet if and only if y is fast. Can we infer the following from them? Some poets will take a plane.
 From the fact that for all y, y is a poet if and only if y is fast we can infer that for all y, if y were fast, then y is a poet. From the fact that for all y, if y were fast, then y is a poet, and that for all y, y is fast we can infer that for all y, y is a poet. Finally, from the fact that for all y, y is a poet, and that there is at least one y for which y will take a plane we can infer that some poets will take a plane. Therefore, the answer is yes.