1.a little=a little bit 修饰形容词或副词,例：He is a little(a little bit )thin.So he runs a little (a little bit )slowly.另：此两个短语还可用来修饰名不可数名词.
2.a bit 用来修饰名词,同时后要加of,例：I want a bit of bread.
3.kind of意为有点,相当于a little,多用来修饰形容词,也可修饰动词,例：She was kind of shy.But she kind of hoped to be invited.
4.kinds of 意为各种各样的,相当于various,例:There are kinds of flowers in the garden.