i couldn´t speak to the boss because...
my sister couldn´t pay for lunch, because
Her plants died because...
he couldn´t buy the new computer because...
he failed his exam, because...
the little girl was crying, because...
the woman slept late because...
i didn´t have to buy groceries because
the kids couldn´t fall asleep last night, because...
the man bought a new camera, because...
he had spent all his money
he had lost his old one
she had left her money at home
i had gone shopping the day before
they had watched a scary movie
she had already left the office
she hadn´t watered them
she had lost her doll
she had forgotten to set the alarm
he hadn´t studied at all