[quote name='p00ndawg']so can I?, The person gifted me half life 1 and episode 1.
But I already have half life 1.
I dont want the gift to go to waste.[/quote]
You could gift it to me! I don't have HL1 and would love to get it.
Does it give you a code or something? If so you can probably just give the other person the code and they will enter it in their steam account. Now if it gives you a link that you click and it activates it automatically on Steam then you are probably out of luck.
However, I think, as in the case of HL2 and Ep1 with TOB. If you already own a copy of HL1 it will give you the option to gift the new copy.