In twenty year, people could take trip to outer space.为什么将来时态里出现could,这里是什么意思.
问题描述：
In twenty year, people could take trip to outer space.为什么将来时态里出现could,这里是什么意思.
答
In twenty yearS,people could take trip to outer space.
虚拟语气.
因为是将来时,还没发生呢,所以需要虚拟.