Which is correct:
"Time fly so fast" or "Time flies so fast"?

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Time fly so fast

This phrase is not correct. Don't use it.

Subject-verb agreement:In this phrase, the subject, time,is singular (like he, she, or it), so it requires the singular verb, flies.

Preferred Form:
Time flies so quickly

Time flies so fast

This phrase is correct.

This is a common idiom used in English to indicate that time seems to pass more quickly in certain situations.

Preferred Form:
Time flies so quickly

Some examples from our editors:

  • Time flies so fast when you're having fun!
  • It's been so long since I've seen you -- I can't believe how fast the time flies!
  • My baby is already starting school; time flies so fast!

Some alternatives from our editors:

  • Time flies quickly.
  • The time has flown.
  • Time really flies.
  • The years have passed quickly.

It is important to make sure the subject (time) agrees with the verb (to fly). In this example, time is singular, so the verb must use the singular form flies.

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Explained by Jane
Editor at TextRanch

Last updated: May 18, 2017

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