few, a few, little, a little
虽然都表示“少”,但
（1）few, a few是可数的, little, a little是不可数的.
（2）a few, a little含肯定意味,few, little含否定意味.这里所谓的“肯定意味”和“否定意味”应该这样来理同样是半杯水,口渴者会认为：There is little water in the glass. 而不口渴的人则会认为：There is a little water in the glass.