I have been missing you very much after I went to college a year ago.这句话中为什么after不能用,要改为since?二者如何区分?

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I have been missing you very much after I went to college a year ago.这句话中为什么after不能用,要改为since?二者如何区分?
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I have been missing you very much after I went to college a year ago.这句话中为什么after不能用,要改为since?二者如何区分?
I have been missing you very much after I went to college a year ago.
这句话中为什么after不能用,要改为since?二者如何区分?

I have been missing you very much after I went to college a year ago.这句话中为什么after不能用,要改为since?二者如何区分?
since是完成时的标志,本句中的have been missing是完成时标志
after指的是过去,给您来个例句;After breakfast Amy ordered a taxi.早饭后,埃米预订了一辆出租车.可见,after一般用在过去时中

因为主句是现在完成进行时(I have been missing), 就要有个“从哪里开始”的延伸,而不是什么之后。

since总是和完成时搭一起用的 效果是表达从过去延续到现在的状态 after 和since 完全不一样,after很多时候就和when一样 对时态没有什么定性要求