Давайте разберем задачу, раскрыв скобки и поставив глаголы в нужную форму (Past Simple, Past Continuous, Past Perfect, или Past Perfect Continuous).
When my parents invited Susan to the party, she couldn't come because she had already made her plans.
When my parents came home, I was sleeping.
Billy had been studying English for five years when he decided to study Spanish.
Two days ago I woke up at 7:30 a.m., made some sandwiches, and went to school.
Yesterday we played basketball for three hours, so we felt very tired in the evening.
The Müllers moved from Germany to the USA in 2013.
Sandra had been training for three years before she won the swimming competition.
Yesterday I did my homework from 6:30 to 9 p.m.
The play had started by the time we got to the theatre.
It was a wonderful night. The snow was falling in big flakes.
The builders had finished their work by afternoon.
At 8 a.m. yesterday, my sister was walking to school.
My brother slept for two days and he felt exhausted.
Maria was watching YouTube while her little brothers were reading a book.
Max had been preparing for the test since Monday morning, that's why he was so confident yesterday.
Last summer, our friends offered us to spend a couple of weeks in Sochi.
I was playing Minecraft for two hours when my computer suddenly broke down.
Надеюсь, это объяснение было полезным!