Question

como passa essa frase para o negativa e interrogativa there are theree tables in that classroom

Answer 1

There aren't three tables in that classroom ( negativa) ou ainda na negativa,
There are not three tables in that classroom

Are there three tables in that classroom? Interrogativa)

Answer 2

Negative form: There are not (aren't) three tables in that classroom;
Interrogative form: Are there three tables in that classroom?