Before to read further answer the question,
How would you say in Russian, “All people were there”?
I am asking that because I’ve heard a lot of times when people (not Russian native speakers) were saying, “Всё люди” and that was wrong.
That’s why I would like to remind you one more word:
всё – sounds like /fsYO/ – everything
весь / вся / всё / все – all (masculine / feminine / neuter / plural)
Я спал весь день – I slept all day (because “day” is a masculine noun)
У тебя вся машина грязная – Your car is all dirty
Это всё на сегодня – that’s it for today
Все мои друзья работают сегодня – all my friends work today
The right answer is
“Все люди были там” – all people were there , sounds like /fsYE/