Диалог на тему: shopping используя как можно больше слова: must, could,can, should

seller: Hello. Can i help you? you: I must buy black shoes.seller: So these shoes.you: How much? seller: 20 $you: But i only have 17 $seller: Sorry, we couldn't help youyou: But i should buy these shoes. These present for my brother.seller: So for these we can doing salle. You can buy these shoes for 17 $you: Thank you very much. You help me.seller: Please, come again.you: Bay, good luck.