I have been here for three years.=It is three years ______I____here

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I have been here for three years.=It is three years ______I____here
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I have been here for three years.=It is three years ______I____here
I have been here for three years.=It is three years ______I____here

I have been here for three years.=It is three years ______I____here
I have been here for three years.=It is three years since I came here.
It is +时间+since从句,相当于现在完成时

since came

It is three years since I have been here.

I have been here for three years.=It is three years since I came here

I have been here for three years.=It is three years since I came here
It is +时间+since+从句 是万能公式