Mark Twain may not have been talking about pronouns when he said “Comparison is the death of joy,” but the sentiment somehow fits. Just ask anyone who struggles with figuring out which pronouns to use with comparatives such as than, as and like.
How can three little words wreak so much havoc with pronouns? The short answer is that all three words can perform multiple functions in a sentence, and when the function isn’t clear, the resulting usage is mixed.