三年来我一直在学英语

I have been learning English for three years.

(学了三年了,还要继续学的)

In the three years I have been learning English

I have been studying English in past three years

I have been studying English for three years.

继续努力，再接再厉。

上面回答的都对。

I have been studying English for the past three years

又没有规定是什麽时态,都对.