Verb tense consistency means keeping verbs in the same tense when they describe the same time frame.
If a paragraph starts in the past, its actions stay in the past until the timeline itself changes. A tense shift is valid when the time moves. A shift without that reason is an error, and it leaves the reader unsure when things happened.
Tense consistency is the rule that one time frame gets one tense. A writer picks a base tense for a passage, then makes every verb about the same moment match it. Narratives and reports of past events take the past tense. Instructions and general truths take the present. Readers use tense to place events on a timeline. So when a present-tense verb turns up in a past-tense story, it tells them time moved when it didn't.
Shift tense when the time of the action changes. A sentence can cover what happened yesterday and what's true today, and each verb takes the tense of its own moment: "She finished the report last night, and it covers the full quarter." Shifts are also correct for general truths inside a past narrative ("He learned that water boils at 100°C"). The same goes for describing what a book or film contains, which by convention takes the present ("In the novel, Gatsby throws parties"). To test any shift, ask whether the time changed. If it didn't, the verb goes back to the base tense.
Most tense errors are unplanned shifts inside a passage that covers only one time frame. They show up in the same few places, so an editor who knows where to look finds them fast.
The writer starts in the past and slides into the present mid-scene: "We walked into the shop, and the owner tells us it's closed." The fix is "the owner told us." This drift shows up most in long anecdotes, where the writer starts reliving the moment and drops into the present tense without noticing.
Instructions mix the imperative with narration: "Open the file. Then you clicked Save." Use the imperative ("Open", "Click") for every step in a sequence.
A writer says "the survey found" in one sentence and "the survey shows" in the next. Either tense can work, depending on your style guide. But once you choose one, keep it for the whole piece.
AI-generated writing shifts tenses because a language model predicts each sentence from patterns in its training data, and that data mixes tenses freely. A model writing a case study can borrow past-tense phrasing from news reports and present-tense phrasing from product copy, then put both in one paragraph. The model also doesn't keep a fixed plan for the base tense, so drift appears far from the opening. When you regenerate one paragraph, the new text does not match the paragraphs around it, which adds to the problem.
Snoika puts human review on top of the human-like content its platform creates, and a tense check fits into that review. The check is the same one any editor can run on a draft:
When you edit a draft, check verb tense consistency first, paragraph by paragraph, then move on to agreement and voice.
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