Take the 2-minute tour ×  I have read this sentence and can not
get "does is" meaning. Which type of grammar is it?
Couchsurfing is a fairly new website, and what it does is it
allows travelers from different parts of the world to meet
people in the destinations they're going to. People offer a
couch in their home or perhaps space on their floor, and in
return you're expected in your own hometown to offer the same
kind of things to people who might visit you.  share|improve
this question Pratik, quotations should be prefaced with a >
symbol at beginning of a line, and not by Code formatting. – 
jwpat7 Jun 19 '12 at 2:48 The 'and what it does is' in this
sentence is overly wordy and unnecessary. It can be replaced
with 'that' with no change in meaning. "... is a fairly new
website that allows travelers..." –  Jim Jun 19 '12 at 3:27  1
Answer 1  No mystery: “what it does” is just the subject of the
clause whose verb is “is”.  Your question is like asking what
“enters wins” means in “The person who first enters