Go with the Pronoun
The house is IS because it is
just 1 (one) house.
Its pronoun
would be IT.
So its
verb
is
IS.
So our house IS
big.
But...our houses ARE big.
Because now their pronoun is THEY.
And if only you has 2 (two) houses, THEY ARE
big.
My two houses are big. (Both of them.)
Want to know how to do Questions?