请进I have learned English for about two years.(改为被动句）English_

原句 I have learned English for about two years.
改为被动句后English变为主语,所以意思是英语被我学了两年,用英文就是
English has been learned by me for about two years.
在这里面,用has因为english是第三人称单数,原句动词learn的被动式是is learned/learnt,因为原句用完成时,改的句子也应该用完成时,所以用"has been learned/learnt".
然后题目只有三个空的话,就把"by me"舍掉,变成
English has been learned/learnt for about two years.

has been learnt

has been learned
因为原句中的动词是have+过去分词learned的形式，所以被动句中形式应一致，因为English是单数，选为has，被动语态的构成形式be+过去分词，应为be learned被学习，而且be 在have或has后边要变成been的形式，所以答案是has been learned。可能解释的有点罗嗦，不知你能否明白？...