Go here and look up both these words:
Further
Farther
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Can anyone help me figure out what's wrong with this sentence?
"The lighthouse is further away than it first appeared."
2 answers
Read this entertaining explanation.
http://www.quickanddirtytips.com/education/grammar/further-versus-farther?page=all
http://www.quickanddirtytips.com/education/grammar/further-versus-farther?page=all