到十二月，他学中文学了就满五年了。
By December, he will have been studying Chinese for five years.
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Will英 /wɪl/|美 /wɪl/
been英 /biːn/|美 /bɪn/
studying英 /ˈstʌdiɪŋ/|美 /ˈstʌdiɪŋ/
解释
将来完成进行时：will 指向十二月；have been studying 强调到那时学习中文这一动作已经持续了五年，且可能仍在继续。
By December, he will have been studying Chinese for five years.
将来完成进行时：will 指向十二月；have been studying 强调到那时学习中文这一动作已经持续了五年，且可能仍在继续。