Past perfect continuous negative 4 - tutto inglese - Imparare l'inglese gratis on line

The journalist (cover) the event before the scandal broke.
They (enjoy) the meal before it was interrupted.
He (maintain) his car, which led to problems.
We (decorate) for the festival before the cancellation.
The scientists (observe) any significant changes.
She (participate) in the discussions.
They (hike) before they tried it on vacation.
I (learn) about this subject before the course.
He (wash) the windows before it rained.
We (collect) feedback before the system overhaul.