Consider the following premises. For all x_11, x_11 is a janitor and x_11 will drink water. For all x_11, x_11 is not a carpenter. For all x_11, x_11 is a carpenter or x_11 is a sailor. For all x_11, if x_11 were a sailor, then x_11 is a taxi driver. Can we infer the following from them? If we can, name the inference rule being used: For all x_11, if x_11 were a sailor, then x_11 is a taxi driver.
That is one of the premises. Therefore, the answer is yes.