Consider the following premises. For all x_3, x_3 will play tennis. For all x_3, if x_3 plays tennis, then x_3 is bored. There is at least one x_3 for which x_3 will make tea. Can we infer the following from them? If we can, name the inference rule being used: There is at least one x_3 for which x_3 will make tea.
That is one of the premises. Therefore, the answer is yes.