all of ... , some of …, none of ... , half of ... , most of ... 
lots of, heaps of,成堆的 loads of成堆的, scads of,成堆的 plenty of +名词
  "a portion of, a series of, a pile of, a panel of +名词
  “限定词+ kind / type I sort of +名词
a kind / sort / type of, this kind / sort / type of ➕s/un
  these kinds of, many I several kinds of 之后的名词,既可以是单数或不可数名词,也可以是
复数名词,动词都用复数。
  many a+ 名词”或 "more than one +名词
  an average of/ a maiority of +复数名词
  看意义An average of 25 persons apply each month 
An average of 25 applications a month is not unusual.