语法的问题,是单数时候就用year's,s在'的前面:oneyear'stime,一年的时间.
当你说很多年的时候,复数years,因为语法上不想让你写成years's,所以就写成years'time:4years'time,4年的时间.
举例:
Apostrophesareusedintimeexpressions(e.g.,threeyears'experience,twodays'pay,oneday'stime).Thesearealsoknownastemporalexpressions.
Inatemporalexpression,theapostropheispositionedbeforethesforsingleunitsoftimeandafterformultipleunitsoftime.Forexample:
Ineverdidaday'sworkinmylife.Itwasallfun.(ThomasA.Edison)
(Asthisisoneday,theapostrophegoesbeforethes.)
Alanwasgiventwodays'notice.
(Asthisistwodays,theapostrophegoesafterthes.)
Thatistheequivalentofoneyear'spay.
(Asthisisoneyear,theapostrophegoesbeforethes.)