“You want to rent some movies?”
You're spending a Saturday evening with your family and everyone is trying to decide what to do together. You make this suggestion.
You want to rent some movies?
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You want to (do something)?
When you're suggesting something for people to do in a casual conversation, you ask "You want to ___?". The words "want to" are often pronounced "wanna" in this situation.
A more formal way to ask this question is:
Do you want to rent some movies?
This would be a better way to make a suggestion to someone you don't know very well. An even more formal way to ask this question is:
Would you like to rent some movies?
This would be a good way to make a suggestion to someone you don't know well and who is older or higher in status than you, like a boss or teacher.
Here's an explanation of the difference between "rent" and "borrow":
When you "rent" something, you pay money to use something that's not yours. Things that people often rent include cars, dvds, and apartments.
The word "borrow" means to use something that's not yours, with the permission of the owner, but without paying money for it. People usually "borrow" things like books, clothes, or money from their friends.