1. I have done this exercises before. I this exercises before. 2. She's stolen the book. She the book. 3. They've read a thousand books so far. They a thousand books so far. 4. We've driven for two hours. We for two hours. 5. It's been three weeks since I last saw you. It three weeks since I last saw you. 6. Mark has seen the match. Mark the match. 7. I've just finished swimming. I swimming. 8. The woman has drunk her cocktail. The woman her cocktail. 9. Emily has broken her leg. Emily her leg. 10. I've written five pages of my essay. I five pages of my essay.