-I am tired
We have swept the garden
We have worked for 3 hours​

1. Am I tired?

Who is tired?

2. Have we swept the garden?

Who has swept the garden?

What have we swept?

We have swept the garden, haven't we?

We or they have swept the garden?

3. Have we worked for 3 hours?

Who has worked for 3 hours?

How long have we worked?

We have worked for 3 hours, haven't we?

You or we have worked for 3 hours?