Please help me with this sentence? Is this question " What goes up but not down?" grammatically correct?

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Tri Nguyen

Corrections · 6

Please help me with this sentence?

Is this question " What goes up but not down?" grammatically correct?

I think it need aux verb

Thanks so much Whitney Pray. Have a nice day!

For me this is correct. To be even clearer you could say "What goes up but doesn't go down?" Or "What goes up but doesn't come down?" depending on the context. But as is it is okay also. :)

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