Question

1a) there are (affirmative)
*
There are a lot of people in the office today
A lot of people there are in the office today
1b) there were (interrogative)
*
Were there books in my backpack?
There were books in my backpack?
1c) there will be (interrogative)
*
There will be a season 8 of Brooklin Nine-nine?
Will there be a season 8 of Brooklin Nine-nine?

Answer 1

there are a lot of people in the office

were there books in my backpack?

will there be a season 8 of Brooklin nine nine?