From what I know, the imperative (bóðháttur) is to be used when you are commanding someone to do something. Do this, clean this, pick this up etc... I'm not sure if it's just the laziness of pronunciation as I've mentioned before or an actual mistake (that i've heard some infants use) but I seem to hear alot people saying just the infinitive form rather than the imperative when commanding people to do something. LOKA!! instead of Lokaðu. Is there any reason for this or in practice should I always say Lokaðu, to tell someone to close a door or something. Thanks.