Past Perfect или Past Perfect Continuous
01. We sold our old house after we [had bought/had been buying] a new one.
02. The road was blocked because a tree [had fallen/had been falling] on it.
03. The street was icy in the morning as it [had been freezing/had frozen] all night.
04. I was full of energy because I [had had/had been having] big lunch.
05. [Had you ever slept/Had you ever been sleeping] in a tent before your camping trip in Italy?
06. There was no spagetti left. How much spagetti [had you cooked/had you been cooking] ?
07. [I'd called/I'd been calling] Jane five times before she picked up the phone.
08. We [had been repairing/had repaired] the car for an hour when John appeared.
09. She [had been teaching/had taught] for 40 years by the time she retired.
10. I didn't give up even if I [had failed/had been failing] so many times.