it is 时间段since从句和it has been时间since从句的区别两者可以互相转换吗,英语专业人士来.

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• it is 时间段since从句和it has been时间since从句的区别两者可以互相转换吗,英语专业人士来.
• it is 时间段since从句和it has been时间since从句的区别嗯……急用……可以等同么麻烦各位了……
• it is 时间段since从句和it has been时间since从句的区别两者可以互相转换吗,英语专业人士来.
• it is 时间段since从句和it has been时间since从句的区别嗯……急用……可以等同么麻烦各位了……
• since+瞬间性动词的疑问It is two years since you come to see me.It is two years since you come here.since后面+的都是瞬间性动词,但第一句表示的是否定,两年没看了,第二句表示的是肯定来了两年了.请问这个since+瞬间性动词表肯定还是否定有没有什么规律判断?把 come 改成came。