同学,很高兴回答你的问题
才看到你发来的求助题,所以回答晚了些
正确答案：
首先,I have learned English for ten years.是正确的,现在完成时,表示从过去到现在或还有可能继续下去的动作或状态.
其次,It is/has been ten years since I studied English.是正确的.
因为It is (has been)+时间段+since+clause,此句型的要点（ 1 ） 在于since前后句子的时态：since前的时态为is或has been,后的时态为一般过去时
Eg:It is(has been) ten years since I joined the army.
译为:我参军已经十年了.
要点(2) since后的动词若为延续性或状态性动词,应译为否定或相反,若为短暂性动词按字面意思翻译.
Eg:1It is(has been) ten years since I was a teacher.
=It is(has been) ten years since I left the army.
译为:我复员十年了.
It is ten years since I smoked.
=It is ten years since I stopped smoking.
译为:我戒烟十年了.
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不明白请继续追问,
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