1. I really need to talk to him but he hasn't returned from Paris yet.
2. Have you already returned that book to her?
3. I've been waiting for several hours but he hasn't come yet.
4. Have you already come home? I need you to do something for me.
5. I know my parents are waiting for my letter but I haven't written it yet.
6. Have you written the essay for tomorrow?
7. I have been sitting in an armchair in the kitchen and thinking about what I should mention in the essay for the whole evening but I still haven't written it.
1.Do they read books every day?
2.Do you surf the Net every day?
3.Does this firm work with other companies?