in和by+将来的时间使用问题

The UK’s 65 plus age group is the faster growing crowd within our population, and likely to reach one in four people in / by 2040.

两个有什么区别，具体什么时候用哪一个呢?

The UK’s 65 plus age group is the faster growing crowd within our population, and （is）likely to reach one in four people by 2040.

by+年份，意为不迟于某一年，可以是该年，也可以是该年之前。in+年份，表示在某一年。

by 2040介词短语是修饰不定式to reach的，不是修饰省略的系词的。故系词为现在时is, 表示likely是现在看到的可能性。

曹荣禄 -

擅长：动词用法,句法问题 | 采纳率 82% | 回答于 1秒前

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其它 1 个回答

陈才 - 英语教师 1秒前

擅长：中考英语,词法问题

The UK’s 65 plus age group is the faster growing crowd within our population, and likely to reach one in four people in / by 2040.

应该改为下面句子

(1)The UK’s 65 plus age group is the faster growing crowd within our population, and will be likely to reach one in four people in 2040

(2)The UK’s 65 plus age group is the faster growing crowd within our population, and will have been likely to reach one in four people by 2040.

备注：in+将来时间，用一般将来时态，介词by+将来时间，要用将来完成时态

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