Is the following sentence grammatically correct as a command?

"Come fast."

I believe this would be a correct alternative:

"Come quick."

closed as unclear what you're asking by TrevorD, Jason Bassford, JJJ, tchrist Mar 24 at 16:14

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  • Come fast, before the cookies are all gone! – Hot Licks Mar 22 at 20:54
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    It might depend on which English-speaking country you are in. It doesn't sound correct to my British ears (except in a sexual context!). If you mean you want someone to come to your location very quickly, I would say "come quickly". "Come quick" grates with me, because the phrase requires an adverb ("quickly") not an adjective ("quick"). – TrevorD Mar 22 at 23:56

It depends on what was intended. To invite people to participate in a religious practice of not eating, “come fast” works but “come quick” doesn’t.

Grammar that doesn’t consider intent is a low bar to cross. If a sentence conveys meaning in some context - any context - it’s grammatical. And some would say that’s already too high a standard for grammaticality.

  • Ah, but "Come quick" could mean "Don't come dead". ;-) – BoldBen Mar 23 at 13:44
  • @BoldBen Aye. :) – Lawrence Mar 23 at 17:56

Let me ease any discomfort you might feel with come fast as an imperative. The source of that discomfort is probably that you think of fast as adjective rather than adverb. It can indeed be an adjective, as applied to a runner, a car, or (in a sexist pejorative sense) a woman. But it can also be an adverb, as in He ran fast.

The horror of using an adjective where an adverb (perhaps one ending in -ly) seems required is often overblown. Before yielding to it, one should remember not only the New Hampshire license-plate motto "Live free or die" but also the opening line of Lamentations in the King James Version: "How doth the city sit solitary, that was full of people!"

  • My quick-running stopwatch endorses this answer. – tchrist Mar 23 at 3:15

Yes it is grammatical. You can use the the idiom: come thick and fast TFD

To come rapidly and in large quantities (as in an attack).

And, come quick or come quickly works too. It all depends on context and sentence structure.

- Leona, come quick! - They come fast at times too. - Papa, Papa, come quickly!

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