Ten years is a long time.Eighty dollars are enough for a stu

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Ten years is a long time.Eighty dollars are enough for a student to study.
为什么谓语动词一个用单数一个用复数?请举一些类似的句子

表示时间、金钱、距离、体积、重量、面积、数字等词语作主语时,其意义若是指总量应看作单数,谓语动词用单数；但如果其意义是指"有多少数量"则应该看作是复数,那么谓语动词也应该用复数.例如：
Four weeks are often approximately regarded as one month.
人们常大约地将四个星期看成一个月.
Twenty years stands for a long period in one's life.
二十年在人的一生里意味着一个很长的时期.
Eighty dollars are enough for a student to spend on food for one month.
八十块钱给一个学生吃一个月的伙食是足够的Eighty dollars isn't a lot of money 八十美元不算一大笔钱

( ) Ten dollars enough three pairs.A.are,in B.is,for C.are,f 英语翻译Ten years,it’s a long time enough that God gives me to g is it enough to have survived for a long time do you think fifty dollars is/are enough for a chair?选is 还是 2.选择 Thirty dollars( )enough for me.A.are B.is C.were Ten dollars are/is a big sum for me哪个正确 You are patient enough to wait for a long time without getti （）He ———for two years .Two years is a long time. A hundred years ＿quite a long time.A.are B.is C.were is it enough to have survived for a long time?高中英语必修二Unit1 中 is it enough to have survieved for a long time 为什么用have done Three years( )a long time for us students A.a