[Haskell-cafe] question regarding the $ apply operator

Hi I have a naive question regarding the basic use of the $ operator, and I am confused why certain times it doesn't seem to work. e.g. The following works: applySkip i f ls = (take i) ls ++ f (drop i ls) But the following doesn't: applySkip i f ls = (take i) ls ++ f $ drop i ls which gives me an error: The first argument of ($) takes one argument, but its type `[a0]' has none In the expression: (take i) ls ++ f $ drop i ls In an equation for `applySkip': applySkip i f ls = (take i) ls ++ f $ drop i ls FYI, I am using GHC 7.0.3 for this. Thanks in advance for comments. Ting