1. The Past Perfect часто употребляется в придаточном предложении после союза after(после того как) для того, чтобы подчеркнуть, что действие придаточного предложения уже завершилось до наступления действия главного предложения:
After she had cried she felt better.
Jessica phoned her friend Louise after she had had a cup of coffee.
After they had shaken hands Steve said, “Thank you”.
2. В сложноподчиненном предложении, в котором придаточное предложение начинается с союза before(прежде чем, до того как) the Past Perfectупотребляется в главном предложении:
Betty had already cleaned the flat before her mother came home.
She had fallen out of love with him before the war was over.
Before I got an excellent mark in Physics I had studied very hard.
3. В сложноподчиненных предложениях с союзами hardly … when; scarcely … when; no sooner … than (едва …. как, не успел …. как). При этом имеет место частичная инверсия, т.е. глагол had занимает место перед подлежащим:
Hardly had he entered the room when he heard some noise.
No sooner had the bell gone than the teacher came into the classroom.
Scarcely had the mother opened the door when the children rushed to meet her.
Однако в предложениях с этими союзами возможен и прямой порядок слов:
He had hardly entered the room when he heard some noise.
The bell had no sooner gone than the teacher came into the classroom.
The mother had scarcely opened the door when the children rushed to meet her.