请教一道sat真题语法
According to some demographers, the number of United States citizens aged 65 or older is likely to rise to 87 million by 2050.
请问一下by 2050不是要用完成时吗?为什么是likely to rise而不是have risen?
人气：279 ℃ 时间：2020-02-03 17:56:59
解答
be likely to do sth.在可能做某事,
by 2050 表示的是将来时间,如用have risen,岂不是"人数已经上升到...",这显然不合事实.by + 将来一个时间点不是应该用将来完成时的吗如此句中没有likely , 可这样用:the number of United States citizens aged 65 or older will have risento 87 million by 2050 .
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