Answer:
Step-by-step explanation:
1: What are you doing?
2: not possible because it doesn0t make sense.
3: Everyone's nice to m9: e. I don't know why
4: I'll be taking a taxi to the airport.
5: It doesn't make sense to change from perfect to simple.
6 Dave is always giving Pam expensive presents.
7: It doesn't make sense because it stands for an action that took place at a certain past.
8: I checked my e-mails. I received loads.
9: It doesn't c¡make sense because it stands for something that is going to happen in an immediate future.
10: She has said that they stood at the Ritz.
11: The winner has been interviewed by Sky News.