i have learned Japanese since two years ago.的时间部分

i have learned Japanese since two years ago.的时间部分
疑问句怎么说
问你几年前开始学的日语
Since how many years ago.......这样对吗 感觉不对啊
就是要突出你几年前开始的since部分

最直接的应该是
since when you have learned japanes?
但是美化一点的问句是how long have you learned Japanese?
但是这句不一定会得到“since”的回答

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