Question

past perfect:
1: I (do) my homework before my mum came
2: he (write) the translation before I arrived
3: liz was in trouble because she ( lose) her way
4: after it ( stop) raining they went to the club
5: she (have) a bath before her mum came home
6: when I switches on the TV the film (begin)
7: we (tidy) the room before our friends came
8: I didn´t open the door because I (not find) the keys
9: I (paint) the wall before my granny phoned me
10:he was tired because he ( work) much
11: I (coppy) the text before pam called me

Answer 1

1) I had done my....
2) He had written the...
3) liz was in trouble because she had lost her way
4) after it had stopped raining...
5) she had had a bath..
6) when I switches on the TV the film had begun
7) we had tidied the room..
8) I didn´t open the door because I hadn't found the keys
9) I had painted the wall.. 
10) he was tired because he had worked much
11) I had coppied the text before..

La estructura del Past Perfect Simple (PPS) es para todas las personas iguales (Had) + el verbo en pasado participio.

Answer 2

I had done my homework...
I had written ...
...she had lost ....
it had stopped...
she had had ...
the film had begun
we had tidied...
I hadn't found ...
I had painted...
He had worked ...
I had copied ...