Consider the following premises. For all x_9, x_9 will play tennis. For all x_8, if x_8 plays tennis, then x_8 is a sailor. If Joseph were bored, then Elisabeth is a sailor. Can we infer the following from them? For all x_8, if x_8 plays tennis, then x_8 is a sailor.
That is one of the premises. Therefore, the answer is yes.