Past Tenses 2
I __________ (have) a great idea for a new website, but someone __________ (think) of it already.
had / had thought
The man on the door __________ (not let) us in because he said we __________ (not have) suitable proof of age.
didn't let / didn't have
I __________ (not can) return the library book because I __________ (not finish) with it.
couldn't / hadn't finished