2017届高考英语语法专题复习教案：必备句型全归纳_高考复习指南

　　自从他离开南京以来,我没有收到过他的信.

　　Since she was in Yangzhou, she has kept in touch with her former friends. ( since she left Yangzhou…)

　　她离开扬州以来,一直同过去的朋友保持着联系.

　　对比:

　　1). I have never seen him since he was ill.

　　他病好后,我就再也没有见到他.

　　2). I have never seen him since he fell ill.

　　他生病以后我就再也没有见过他.

　　It is / ( has been ) + 时间段 + since + 过去式

　　It is / has been two years since his father died.

　　= his father has been dead for two years. = his father died two years ago.

　　他的父亲去世两年了.

　　It has been 8 years since I graduated from university.

　　= I graduated from university 8 years ago.

　　It is 3 years since he smoked. 他三年不吸烟了.(即,从句动词延续性的,译成否定意义;从句动词非延续性的,译成肯定意义.)

　　It is 3 years since he left school.-----他毕业三年了.

　　7….until…直到…时候; not…until…直到…才…

　　You are to stay here until / till your mother comes back.

　　The meeting was put off until ten o’clock.

　　Not until we watched the Earth Day program on TV did we know much about global warning.

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