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7 Have you been playing about with it? 8 Have you been studying it long? 9 Have you had enough to eat? 10 Ann has never gone camping. She has never slept in a tent 11 We have been waiting for you .. 12 has failed . hasnt been working

 

7 Have you played about with it?
8 Did you study it long?
9 Have you had enough to eat?
10 Ann has never gone camping. She hasn't slept in a tent.
11 We have been waiting for you since 1 p.m.
12 I'm not surprised he failed his exam. He hasn't worked hard recently.