到下个周末，我学法语就满四年了。
By next weekend, I will have been studying French for four years.
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Will英 /wɪl/|美 /wɪl/
have英 /əv/|美 /əv/
been英 /biːn/|美 /bɪn/
studying英 /ˈstʌdiɪŋ/|美 /ˈstʌdiɪŋ/
解释
将来完成进行时由 will have been + 现在分词 studying 构成，站在下个周末这个将来时间点回顾，强调学法语已经持续了四年。
By next weekend, I will have been studying French for four years.
将来完成进行时由 will have been + 现在分词 studying 构成，站在下个周末这个将来时间点回顾，强调学法语已经持续了四年。