Question

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There isn't a sandwich in the box, ....? 
The Browns wanted to have lunch at home , ... ?
There isn't a mouse in the house , ...?
The Greens are watching tv , ... ?
the Greens watch tv in the evening , ...?
The Greens watched tv yesterday 

Answer 1

There isn't a sandwich in the box, is there?
The Browns wanted to have lunch at home, did't they?
There isn't a mouse in the house , is there?
The Greens are watching tv , are't they?
the Greens watch tv in the evening , do't they?
The Greens watched tv yesterday,  did't they?

Answer 2

There isn't a sandwich in the box, is there?
The Browns wanted to have lunch at home, did't they?
There isn't a mouse in the house, is there?
The Greens are watching TV, are't they?
The Greens watch TV in the evening, don't they?
The Greens watched TV yesterday,  didn't they?