A Lot Of / Lots Of
These two expressions both mean a great deal of or several. They are used before a count or non-count noun. These two expressions tend to be used in informal English.
Examples:
We need a lot of people for this game.
She likes lots of jam on her toast.
A Lot
Use a lot at the end of a sentence as an adverb. A lot is NOT followed by a noun. The meaning is the same as a great deal.
Examples:
I enjoy swimming a lot.
Mary seems to travel a lot.
http://esl.about.com/od/grammarintermediate/a/cm_lot.htm
2012년 11월 8일
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"lots of" sounds a bit more informal than "a lot of".