Question

用英文翻译“我已经学习英语四年了”

Answer 1

我感觉应该是
I have been learning English for four years.
我已经学习英语四年了，用现在完成进行时表示这个动作是延续性的，这四年你一直都在学习英语，没有间断过，学习这个动作是连续的。
而如果用 I have studied English for four years, 这是现在完成时，也就是已经study完了，实际上你这四年实在不断的学习过程，所以这样的翻译我感觉是不恰当的。
当然，可以问问高手，看他们怎么说

Answer 2

I have learned English for four years.
I have been learning English for four years.
It is four years since I began to learn English.
很高兴为你解答！
老师祝你学习进步！
请及时采纳哦！多谢你的问题！^_^

Answer 3

I have studied English for four years.

Answer 4

I have learned English for four years.

Answer 5

I have already studied English for four years.