未来完成进行时表示到未来某一时间点为止，仍旧在继续的动作。
You will have been studying Japanese for five years by nest March.
到下明年三月为止，你就学习日语5年了。
She will hane been teaching Russian for ten years by next April
直到明年四月为止，她教俄语就满十年了。
温馨提示：
