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"Time flies so fast" vs "Time fly so fast"

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.

Last Updated: March 19, 2017

Time flies so fast

This is correct

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

ExpertExplanation provided by a TextRanch English expert

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.

Time fly so fast

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

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

ExpertExplanation provided by a TextRanch English expert

Preferred Form:
Time flies so quickly

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