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.