Как будет на : "почему мне до сих пор не отправили заказ? "

1) I was lighting a candle when Jim came in.

2) Jack was swimming from 5 to 6 pm yesterday.

3) Sally was drinking tea at 8 am yesterday.

Объяснение по каждому пункту:

1) В данном предложении оба времени, поскольку это предложение по конструкции с when—Past Continuous и Past Simple.
Past Continuous—процесс, а Past Simple—одноразовое действие. Процесс у нас уже есть(was lighting), соответственно вставляем глагол в Past Simple.

2) В этом предложении вставляемся Past Continuous, потому что указан процесс и также тут два указателя времени(с 5 до 6 вечера вчера). Джек плавал с 5 до 6 вечера вчера. С 5 до 6–явно процесс.

3) В этом предложении два указателя времени—at 8 am, yesterday(в 8 часов утра, вчера). А когда два указателя времени—ставим глагол в форме Past Continuous.

Presentation by Ellie Hugo, what are Nazca lines? Hugo These are huge drawings of birds, animals and insects. They were slammed into the ground. ELLIE Why are they called the Nazca lines? Hugo Because they were made by the Naskans. They lived in Peru thousands of years ago. When were the drawings made? Ally They have been made for a thousand years, from about 500 B.C. before 500 AD The Naskans buried the drawings in the sand, and they have not been found for thousands of years. Have you really seen these drawings? Hugo No, I haven't, but I would like to, because I'm sure they are a fantastic sight. From the ground they are not very visible, because they are so big - you need to climb to a height of several hundred meters.