Question

You.... all be here ten minutes before the concert​

Answer 1

Ответ:

Объяснение:

Вы все должны быть здесь за десять минут до концерта

you must all be here ten minutes before the concert​

Answer 2

It seems like you want to express the idea that everyone should arrive ten minutes before the concert starts. The sentence you provided is a bit unclear, so here's a clearer version:

"Please make sure to arrive at least ten minutes before the concert begins."