Поставьте глаголы в Past Continuous
write
not to do
go
play
read
sleep
clean
have breakfast
have lunch
walk

Was/Were writing, wasn't/weren't doing, was/were playing, was/were reading, was/were sleeping, was/were cleaning, was/were having breakfast, was/were having lunch, was/were walking.
Выбор was/were зависит от числа. Если единственное, то was. Если множественное, то were.
Например: They were writing.
He was writing.