Practise grammar from Activate B1 Unit 7.
Rings
Had been ringing
Rang
Flooded
Had flooded
Had been flooding
Had arrived
Had been arriving
Arrive
Had been taken
Had taken
Took
Been finishing
Finished
Finish
Been waking
Woke
Woken
Had been coming
Came
Had come
Had paid
Paid
Had been paying
Had been studying
Had studying
Study
Been seeing
Saw
Seen