he study english for six years by the time he takes his examination

he study english for six years by the time he takes his examination

题目
he study english for six years by the time he takes his examination
5.He _______ (study) English for six years by the time he takes his examination.这个怎么填,为什么
答案
将来完成时will have done
主句:他学习英语将达到六年时间
从句:by the time引导
完成时概念:动作发生在过去,对现在造成一定的影响或还将持续下去for six years,
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