当Two days 或者 two years 做主语是算是单数还是复数?

当Two days 或者 two years 做主语是算是单数还是复数? two-day,two days,two-days,two day 的区别 two days before是什么意思 two days in two days later ; in two days ; for two days ; two days late的区别 Two days a week two days later about two days two days after和after two days的区别 two days after和after two days的区别是什么? 两天以后怎么说?是不是in two days after two days after two days和in two days的区别 About for two days.还是About two days? it takes two days 和it spends two days区别 two more days is enough They stay___my ___family two days. These two days good happy! About two days age 紧急