I understand it's not the present tense, else it would be "goes". Is the sentence grammatically correct? If so, does it mean "you are seeing that it is going away"?

marked as duplicate by AmE speaker, Edwin Ashworth, tchrist Dec 21 '17 at 2:51

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  • It looks no more than a simple present to me. Why wrack the brains? – Kris Dec 20 '17 at 11:33
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    @Kris The OP has already explained that it cannot be present tense - it has no third person /s/ inflection. – Araucaria Dec 20 '17 at 11:46
  • Just for the sake of completeness, when I read the title alone, my interpretation was of an imperative sense. I envisioned someone annoying the speaker for a demonstration, the speaker finally relenting, ending with an exasperated, "(There.) You see it, (now) go away!" – cobaltduck Dec 20 '17 at 12:33
  • @cobaltduck to avoid this double meaning, the example sentence could be "you see it go up and down" – Max D Dec 20 '17 at 18:00
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    Notice that one would say "You saw her go away" not "You saw she go away. – tchrist Dec 21 '17 at 2:49

Verbs of perception (see, hear, notice, etc.) are followed by an unmarked infinitive — technically a present infinitive, but the past infinitive can't be used in this construction — or a present participle. I saw him go. I saw him going. The difference is a slight emphasis either on the action as a whole (infinitive) or as a progressive activity one observes (present participle). Though in the objective case, "him" is actually the subject of the infinitive "go." https://dictionary.cambridge.org/de/grammatik/britisch-grammatik/verb-patterns/hear-see-etc-object-infinitive-or-ing

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