Откройте скобки и используйте или «обнажите» инфинитив:
1. He was so clever that he could (to answer, answer) all possible questions. 2. The story was too short (to be read, be read), at the lesson. 3. Bob is as pleased as Punch (to have been praised, have been praised) in the class. 4. We must (to arrive, arrive) there in the morning. 5. You ought (have been, to have been) more attentive during the last test. 6. He seems (to be asking, be asking) stupid questions - look, everyone is smiling. 7. Kate asked me to show how (open, to open) the box.