Learn Icelandic: Kom hingað og gef mér vatnið! - Come here and give me the water!

In Icelandic, the singular imperative (command form) is usually just the stem of the verb. You find this by taking the infinitive (the dictionary form) of the verb, like koma (to come) or gefa (to give), and dropping the final -a. This leaves you with the commands kom and gef.

I have often heard Icelanders say komdu instead of kom. Are they both right?

Yes! While kom is the basic grammatical command form, Icelanders very often attach the word þú (you) to the end of the verb. When attached, it changes into -ðu, -du, or -tu. So komdu (come!) and gefðu (give!) are actually much more common in everyday spoken Icelandic than just kom and gef.

Why does the sentence use hingað for here instead of hér?

Icelandic has different words for here depending on whether there is movement. You use hér when someone or something is already located in a place. You use hingað when there is motion towards a place, like the old English word hither. Since the command is to move to this place, we use hingað.

Why is me translated as mér instead of mig?