Чем отличается have had от have has?

Have.Had - past simple
have.has -перевод есть

1) Nick:Bob!What are you doing in the kitchen?
Bob: I'm cooking right now. 
Nick:That sounds nice.How long have you been cooking it?
Bob: I have been cooking for hole day and I'm pretty tired. 
2) Nick:Jane,I need your help.
Jane:Excuse me,I am really busy now. I'm doing mt homework. Ask Sam
Bob:Sam isn't in.I asked him to do shopping.
Nick:Is he going to come soon?How long has he been in the shopping centre? ( не уверена по поводу времени, подумайте сами)
Bob:Well, he has just gone. 
Jane:OK.I've done it already and i am going to help you,Nick.

Ukraine beautiful country . There are often tourists come from countries bizhnih summer sea . I would also like to go there with my friends detom . But now there is a war . People are fighting against each other and no one does not like it . I would like to see this war is over, and all the world was over his head . People do not deserve to live like that . Nobody should strodat . Neighboring countries, like Russia , are trying to help people living in the Ukraine. There are brought out of food , water , clothing, stuff. I hope that Ukraine skorrzhivuschie remember what a quiet life . (Получай)