I (not read)the book before.(现在完成时)

haven't
read
现在完成时have/has+动词的过去分词
祝你进步

扩展阅读：press f5 to run onboard ... atc stand by ls ... bad north ... atc not ready解除 ... there is no game ... alter the ac power ... pot up sensor alarm ... atc not ready 三菱 ... a university ...