It is ...+ since ...与It has ...+since ...的区别?It has been 2 years since we began to learn English.It is thirteen years since Hong Kong returned to China.今天在一本书上看到这两个句子,语法上都是对的吗?如何区别?

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It is ...+ since ...与It has ...+since ...的区别?It has been 2 years since we began to learn English.It is thirteen years since Hong Kong returned to China.今天在一本书上看到这两个句子,语法上都是对的吗?如何区别?
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It is ...+ since ...与It has ...+since ...的区别?It has been 2 years since we began to learn English.It is thirteen years since Hong Kong returned to China.今天在一本书上看到这两个句子,语法上都是对的吗?如何区别?
It is ...+ since ...与It has ...+since ...的区别?
It has been 2 years since we began to learn English.It is thirteen years since Hong Kong returned to China.今天在一本书上看到这两个句子,语法上都是对的吗?如何区别?

It is ...+ since ...与It has ...+since ...的区别?It has been 2 years since we began to learn English.It is thirteen years since Hong Kong returned to China.今天在一本书上看到这两个句子,语法上都是对的吗?如何区别?
两者没有太大的区别,可以互换使用.第一个句子只是强调动作延续的时间长度;第二句仅表示客观事实.