The phrase "it's hard to believe" is used to express surprise or skepticism about something being true. It can indicate that a situation or story seems unbelievable or improbable.
This phrase is often used in contexts where the speaker finds it difficult to accept or trust the information being presented. It can also be used to express astonishment at how quickly time has passed or how much something has changed.
For example:
It's hard to believe that she managed to finish the entire project in just one day!
He told me his age, but it's hard to believe he's already 65 – he looks so young!
It's hard to believe we've been friends for over 20 years.
It's hard to believe it's been five years since we graduated.
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