Sam began to read thia book an hour ago(for)改写句子

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Sam began to read thia book an hour ago(for)改写句子

Sam began to read thia book an hour ago(for)改写句子
Sam began to read thia book an hour ago(for)
改写句子

Sam began to read thia book an hour ago(for)改写句子
It has been one hour since she began to phone.She has been on the phone for an hour.She has been on phone for more than one hours

句意是:sam 从一小时之前就开始看这本书(言外之意他没有看完,一直在看)
Sam is reading this book for an hour

Sam has been reading this book for an hour.