Which is the difference between "a lot of" and "lots of" ?
For example, between "I watch a lot of movies" and "I watch lots of movies", which sentence is the correct one ?

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The meaning is the same, the difference is lots of is one word less.

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The first sentence implies that you watch a big group of movies, while the second means you watch many big groups of movies.

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Opps! Sorry.  I didn't read your question.  "Which" is correct.  :-)

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Not which,,,,,,,What is the difference?
There is no difference.