You need to see a doctor, —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?

You surely fail if you fail to plan, don’t you?

A good plan scarcely lets you fail, does it?

So, plan before you proceed, won’t you?

One need not think of others, need they/need one?

You had better drink cold water, hadn’t you?

Thank you very much, don’t I?