You're buying a new computer at an electronics store. You've told the salesperson which computer you want to buy, and then he asks:
That comes with a 90-day warranty. Would you like to purchase an extended two-year warranty?
Sometimes when you buy something, there are extra free items that you also get for free. To describe this, use "___ comes with ___":
The chicken comes with french fries or steamed veggies. Which one would you like?
A: Where'd you get that case?
B: It came with the phone.
The phrase "a 90-day warranty" means a warranty that lasts for 90 days. Here are some other examples of similar phrases:
Call now for a free 30-day trial!
This is something that you see and hear on advertisements a lot.
There's a 3-day weekend coming up.
This is what you call it when there's a holiday on a Monday or Friday.
Also take a look at this PhraseMix lesson:
Which item did you purchase?
As a customer, you use "purchase" when you're making a formal complaint to a company:
I purchased one of your two-person backpacking tents through your online store last week, but when it arrived there was a large tear in it.
Another place where you'll often see the word "purchase" is in written descriptions of things that people or companies bought, like in newspapers:
Apple has purchased Quattro Wireless for $275 million dollars.
You can also use the word "purchase" as a noun, without any changes in spelling or pronunciation. For example:
Thank you for your purchase.
When you buy a new product like a car or a piece of electronic equipment, it usually comes with a warranty from the company that makes the product. The warranty is a kind of legal agreement. The company promises that their product will continue to work for a certain length of time. If it doesn't, the company will replace it or refund the customer's money.
In the U.S., products usually come with a "manufacturer's warranty", which is 90 days for a lot of products. But stores also try to sell their customers an "extended warranty", which costs extra but protects the product for a longer time.
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