4. Sarah wants to go away for her birthday but she also wants to have a big party with all her friends. It sounds to me like she wants to have her cake and eat it.

Meaning: “You can’t have your cake and eat it” means that you cannot have two desirable but incompatible things at the same time.

Перевод: «Нельзя и рыбку съесть, и косточкой не подавиться» — это значит, что нельзя одновременно получить две несовместимые вещи или выбрать оба взаимоисключающих варианта.