1knew.hadn't learnt
2left.had already begun
3didn't know.had already arrived
4came.saw.had cooked
5had studied.entered
6was going.looked(здесь Past Continuous,а не Past Perfect)
7had taken.came
8had returned
9got.had already started
10came
11thought.had already returned
12was sure.didn't recognize
13did you find...had lost
14said.had been
15arrived.had already helped
1)He was dancing in the room yesterday morning.
We were playing basketball at ten o'clock.
I was having a shower when you phoned.
Tim was having breakfast at seven o'clock yesterday.
2)began
you were drinking
she was having
when i turned
3)making,carrying,wearing,tying
Jane has got a rabbit.
Jane's rabbit is white.
It isn't black.
It can play with a ball.
It can't swim.
Тут тільки 8 речень але думаю підійде.