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"?

  • 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 - Not here any more. 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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