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1) Is there always heavy traffic in this street?
There is always heavy traffic in this street, isn't there?
2) Do we live in a big house?
We live in a big house, don't we?
3) Does he walk along the street with his dog?
He walks along the street with his dog, doesn't he?

2) Do we live in a big house?
We live in a big house, don't we?
3) Does he walk along the street with his dog?
He walks along the street with his dog, doesn't he?