Does beware exist as anything other than an imperative?

[conuly]

I bewore the dog? I waswore the dog? I wasware the dog? I bewared the dog?

Comments

[wakasplat.livejournal.com]

I've heard "to beware" and "can beware". As in, I need to beware of this, I can beware of that, and so forth. In fact, I just looked it up in the dictionary and it says it only takes the infinitive and imperative, which is what I suspected.