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赖世雄教你学英语语法 时态及语态 1-16:It is+时间+since

赖世雄教你学英语语法

时态及语态

1-16:It is+时间+since

It is+时间+since... 自从……
=It has been+时间+since...

例:It has been five years since I saw you last time.
= It is five years since I saw you last time.
(自我上次见到你,至今已有五年了。)