Identify the form of each of the following arguments and state whether the argument is valid or invalid:

When we regard a man as morally responsible for an act, we regard him as a legitimate object of moral praise or blame in respect of it. But it seems plain that a man cannot be a legitimate object of moral praise or blame for an act unless in willing the act he is in some important sense a “free” agent. Evidently free will in some sense, therefore, is a precondition of moral responsibility.