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what are the main differences between gerund and infinitive
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Anonymouswhat are the main differences between gerund and infinitive
The gerund ends in '-ing' and the infinitive is usually prefaced by 'to'. Your question is very general. You can start by reading about the two forms at these links:

http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/gerinf.htm

http://grammar.ccc.commnet.edu/grammar/gerunds.htm

http://www.writing.utoronto.ca/advice/english-as-a-second-language/gerunds

http://grammar.ccc.commnet.edu/grammar/verblist.htm