I have a lot of pens
I have lots of pens
What is the difference? I do not see any difference but as per my teacher there is a difference which till date I am unable to understand
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If they want to get really detailed, a lot means a specific amount--lot being the amount.
Say pen boxes come in sets, or lots, of 10. If you have a lot, you have 10.
To me, I have lots of pens means you have some amount of pens that is great in amount.
I think, however, people use these statements equally. And, in my opinion, I like the second one more because it uses less words, making it quicker to read.