How time flies! We still wanted to do many other interesting things. But it was time to say goodbye.
I can't figure out whether to use flies or flew here. Is it talking about general facts that the author thinks are true?
How time flies! We still wanted to do many other interesting things. But it was time to say goodbye.
I can't figure out whether to use flies or flew here. Is it talking about general facts that the author thinks are true?
People often write The time flew by when describing a past experience such as an enjoyable holiday. However, you have written it as an exclamation, so the present tense is appropriate. "Time flies" is a general comment on how quickly time seems to pass.
Mari-Lou has pointed out that "How time flew" can also be used as an exclamation. However, the present tense version is the 'classic' one, being derived from the Latin Tempus fugit
"How time flies" is a common exclamation - meaning 'doesn't time go quickly?'.
You would use the present tense, "How time flies", when referring to time in general ('doesn't time go quickly these days?'). The past tense, "How time flew", refers specifically to that occasion ('it felt like the day was over in no time'). However, as other commentators have said, it would be far more common to use the present "How time flies" in your example, as this is a common idiom.
As an aside, "Time flies when you're having fun" is a variation on this - either used literally (e.g. at the end of a fun day out), or ironically (e.g. after a long tedious journey!)
When referring to a particular period or experience, I would use the appropriate tense with the time:
When we were at that festival, how the time flew [by]!
How the time has flown this past week!
When we went on holiday when I was little, how the time would fly!
Once you get there, the time's gonna fly!
(It's possible to leave out the in these, but that feels less natural to me. I would quite likely add by to these: "how the time flew by".)
But as a general, timeless expression (and by far the most common form) is with the so-called "present simple" (i.e. timeless) tense, and no article (and no "by"):
How time flies when you're enjoying yourself!