Look at the picture above and try to guess the meaning of the idiom 'time flies.'
Time flies: time goes by very quickly.
Surprise: This phrase can imply there has been a surprise—It's surprising the time went by so quickly and you didn't notice it.
Since this is something that is surprising, this phrase is often accompanied by "I can't believe," "it's hard to believe," "already," and "it seems like."
Again, because it's surprising it's also used as an exclamation: "How time flies!" or "Doesn't time fly!"
Having a good time: This phrase can be used to describe ANY type of quick passage of time, however, it's frequently used with the phrase "time flies when you're having a fun." That is, you're having such a good time you don't notice that it's passing so fast. But as you can see from the examples below, it can be used to describe any type of quick passage of time.
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Ready to practice? It will help you better remember this idiom in the future. When is the last time when time flew for you? What were you doing? In what types of situations does time fly for you?