Question

I__(learn) english for more than three years可不可以填have learning?

Answer 1

不可以。
应该填have learned
现在完成时的基本结构是：have/has + 过去分词
或填have been learning
现在完成现行时的基本结构是：have/has been doing

Answer 2

肯定不能啊，have不是实意动词，它是助动词。for+一段时间要用现在完成时，所以用have learned

Answer 3

have been learning可以，
have learning不可以，有语法错误。

追问

have learned和have been learning哪一个更恰当

追答

have learned更常用一些。
have been learning也可以用，更多强调我现在依然在学习。
两句语义有些微妙差异。

Answer 4

不可以。可以填have been learning