1) After lunch you go to see a friend at her home. She says "Would you like something to eat?" You say: "No, thank you. I have lunched yet". 2. Bill goes out. Five minutes later, the phone rings and the caller says: "Can I speak to Bill?". You say: "I'm afraid just have gone out". 3. You are eating at the restaurant. The waiter thinks you have finished and starts to take your plate away. You say: "Wait a minute! Haven't finished". 4. You are going to a restaurant this evening. You phone to reserve a table. Later your friend says: "Shall I phone to reserve a table?". You say: "No, have done it".