1. He is determined to become a doctor. -> He has set his heart on becoming a doctor. tại sao dùng has set ạ? sao không dùng sets 2. One of the patients in a local hospital has typhoid. -> One of the patients in a local hospital has been diagnosed with typhoid. tại sao has been ạ? đề đang là thì hiện tại đơn mà:(( sao không "... is diagnosed with typhoid" 3. I've lost interest in going to the same place all the time. -> I'm fed up with going to the same place all the time. sao lại I'm mà kp I've như đề ạ? 4. I'm absolutely sure he took the money on purpose. -> He couldnt possibly have taken the money by mistake. sao là have taken mà kp took ạ? 5. He had no idea how difficult the task would be until he was halfway through it. -> Only when he was halfway through the task did he know how difficult it would be. -> Only when he was halfway through the task did he know how difficult it was. câu này đổi như thế có đúng không ạ?