gulfsa number of , a great many of a few等只能修饰可数名词。a little ,a great deal of等只能修饰不可数名词。a lot of , plenty of修饰可数名词和不可数名词都行。
以辅音字母+y结尾，都要把y变成i再加es，像上面所说到的theves,knives,还有familes等等。
