Помоги перефразировать предложения, используя Past Perfect: I saw Helen yesterday, she was the same as before

Конечно, давай переделаем предложения, используя Past Perfect! Это как Past Simple, только показывает, что действие закончилось до другого действия в прошлом. 1) I saw Helen yesterday, she was the same as before (not to change a bit). I saw Helen yesterday, she hadn't changed a bit. *Перевод: Я увидел Хелен вчера, она совсем не изменилась.* 2) Mum gave me a sandwich to eat but I wasn't hungry (to have breakfast). Mum gave me a sandwich to eat but I had already had breakfast. *Перевод: Мама дала мне бутерброд, но я уже позавтракал.* 3) We wanted to go to the country by car but we couldn't (to break down). We wanted to go to the country by car but it had broken down. *Перевод: Мы хотели поехать за город на машине, но она сломалась.* 4) I was going to do the flat, but it was clean thanks to my sister (to clean the flat). I was going to do the flat, but my sister had cleaned it. *Перевод: Я собирался убраться в квартире, но моя сестра уже убралась.* 5) When I came home and wanted to help my mum, the dinner was on the table (to cook dinner). When I came home and wanted to help my mum, she had already cooked dinner. *Перевод: Когда я пришел домой и захотел помочь маме, она уже приготовила ужин.*