Consider the following premises. If William makes tea, then Charles is sleeping. If Linda takes a plane, then Charles is sleeping. If David were a poet, then William is making tea. Linda is taking a plane. Can we infer the following from them? Charles is not sleeping.
 From the fact that Linda is taking a plane we can infer that Linda is taking a plane or David is a poet. From the fact that if David were a poet, then William is making tea, and that if William makes tea, then Charles is sleeping we can infer that if David were a poet, then Charles is sleeping. Finally, from the fact that if Linda takes a plane, then Charles is sleeping, that if David were a poet, then Charles is sleeping, and that Linda is taking a plane or David is a poet we can infer that Charles is sleeping, which contradicts that Charles is not sleeping. Therefore, the answer is no.