One third of the students __(be)in the class.句子的主语是?be根据什么变换形式呢?

ONE OF A KIND THE RISE AND FALL OF STU UNGAR怎么样 one third of one-third of z one ...another...a third...还是the third march is the third month of a year.___ ___ is the third one of a year? One-third of the students in this class are girls.这句中的主语为什么是One-third? The population of the earth_______increasing fast.One third of the populati one-third of the area是整体么?seventy percent of the trees 是整体么? one third of the boys in our class dream of being ______(policeman)in the future how much is 4 multiplied by the difference of one-half and one third? I like neither of the two books.Please showme (a third) one.这里为什么要填a third? －－of the population of this country are famers. A.First three B.One third the third one is carrying the fewest of all的意思? i have finished one third of the work and the rest___left for you 主谓一致 i have finished one third of the work and the rest___left for you 主谓一致 i have finished one third of the work and the rest___left for you 主谓一致 one third of population和one third of country的谓语为什么不同?为什么one third of population用ARE,而one third of country用IS ? Close Encounters of the Third