have you read this book?do you read this book?为什么疑问词要用have 而

两句意思不一样,Have you read this book?是“你曾经读过这本书吗?”have是现在完成时的时态助动词,后面的read是不规则变化的过去分词,虽然长得和原形一样,但要读作[red]Do you read this book?是“你（经常）看这本书吗?”后面的read就是动词原形了,读作[ri:d]