I was crying like a baby because...
I had watched a very sad film.
He wasn't hungry because...
he had eaten a big breakfast.
I was really excited because...
I hadn't gone to London before.
I was in jail because...
I had robbed a bank.
When I got to the airport...
my plane had already taken off. / my friends had already arrived.
I looked angry because...
everyone had forgotten my birthday.
My eyes were red because...
I hadn't slept.
I failed the English test because...
I hadn't studied.
Why did you say ‘I’ll never talk to you again!’ to your best friend?
Because s/he had talked trash behind my back.
I didn't want to go to the cinema with my friends because I (already see) the film
had already seen
Why did you say ‘I'm sorry!’ to your teacher?
Because I had forgotten to do my homework.
Why did you say ‘No way!’ to your best friend?
Because s/he had invited me to go running.
Why did you say ‘Don’t do that again!’ to your dog?
Because he had eaten my favourite pair of shoes.
My cousins didn't come to my party because I (forget) to send them an invitation.
had forgotten
I was REALLY happy because...
I had won the lottery.