It would have been useful if you had posted this question along with the other one you started immediately before ( http://thegrammarexchange.info...0600179/m/6532964347
) as it is closely related to this one.
(1) sounds strange because it would be unusual for more than one boy to ask her out at the same time.
(2) and (3) are fine as they mean that you can borrow as many books as you want or bring as many people as you like.
In the other thread I mentioned above (I only don't understand (3)), "any" in subject position needs to be accompanied by a singular noun to mean "anyone" or "anybody."