None of us can solve this problem, —Tag Question?

The boys were saving money, weren't they?

Let’s have a walk outside the farm, shall we?

I am in the habit of walking every morning, aren’t I?

Morning entertains us with fresh air, doesn’t it?

But all can’t be optimistic, can they?

None but the optimists are accepted by all, are they?

So, one can have peace and happiness in a nuclear family, can’t they/can’t one?

We can hardly live without them, can we?

The people who are insincere, can hardly succeed, can they?

If we take some pragmatic steps, we can solve this problem.