Most essay feedback focuses on two things: grammar and argument. Grammar is easy to check — software has handled it reliably for years. Argument is hard to assess automatically. But between grammar and argument lies a large and important middle ground: the structural and stylistic decisions that determine whether an essay reads as polished academic writing or as something that's clearly a first draft. These are the mistakes that AI writing feedback is now genuinely good at catching.

None of the five mistakes below will make your lecturer write "grammatical error" in the margin. They're subtler than that. But they accumulate, and experienced markers feel their effect even when they can't always articulate it. Your essay just feels slightly difficult. Slightly unconfident. Slightly like it hasn't quite committed to its argument. Here's why, and here's how to fix it.

1

Vague pronoun reference

"This demonstrates…" "It is evident from this that…" "These findings show…" — sentences like these appear constantly in student essays. The problem is that "this", "it", and "these" are doing double duty: they're both referring back to something previously stated and carrying the analytical weight of a claim. When the referent is unclear, the reader has to stop and re-trace their steps to understand what's being asserted.

✗ "The results were significantly higher in the treatment group than in the control. This is an important finding."
✓ "The results were significantly higher in the treatment group than in the control. This difference is significant because it suggests the intervention produced a measurable causal effect rather than merely tracking a pre-existing trend."

The fix is simple: replace "this", "it", and "these" with a specific noun or noun phrase that names exactly what you're referring to. "This difference", "this claim", "this pattern of evidence." It takes seconds and makes an immediate difference to reading clarity.

2

Transition words without transition logic

Transition words signal a logical relationship between sentences or paragraphs. "However" signals contrast. "Furthermore" signals addition. "Therefore" signals consequence. The mistake — so common it's almost universal in first drafts — is using a transition word without the underlying logical relationship actually existing.

✗ "The policy achieved its primary objectives. Furthermore, it was implemented in 2019."
✓ "The policy achieved its primary objectives. Moreover, it did so under resource constraints that were considerably tighter than those available to comparable initiatives — making the outcome more significant, not less."

AI can assess whether the logical relationship implied by a transition word is actually present in the surrounding sentences. If you write "however" and the following sentence doesn't contrast with what precedes it, that's flagged. Reading your transitions carefully — asking "does this word describe the actual relationship between these two ideas?" — will catch most of these before submission.

3

Paragraph topic sentences that bury the argument

The first sentence of a body paragraph is meant to signal what the paragraph will argue. In practice, many students open paragraphs with contextual or historical throat-clearing before they get to the point. By the time the actual argument appears — sometimes in sentence three or four — a skimming reader (or a tired marker) may have already disengaged.

✗ "Opening: The debate around X has a long history, with scholars since the early twentieth century engaging with the question. Smith (1923) was among the first to systematically address the issue, though his framework was limited by the empirical tools available at the time. More recent work has sought to address these gaps."
✓ "Opening: Recent scholarship has significantly revised Smith's (1923) original framework, demonstrating that the mechanisms he identified operate differently under conditions of [X] — a finding with direct implications for this essay's central argument."

Your topic sentence should state or strongly imply the argument of the paragraph. Background belongs in the body of the paragraph or earlier in the essay, not at the start of a point you're trying to establish.

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4

Undifferentiated passive voice

Passive voice is not wrong. In scientific writing, it's often required ("the samples were treated with…"). In analytical writing, it's sometimes the right choice when the agent genuinely isn't relevant. The problem is habitual, undifferentiated passive voice — using it because it sounds more academic, rather than because it's the better construction for that particular sentence.

✗ "Habitual passive: It has been argued by several scholars that… A position has been taken by this essay that… The evidence that has been gathered suggests…"
✓ "Active where appropriate: Several scholars have argued that… This essay argues that… The evidence suggests…"

Passive voice creates distance — which is appropriate when discussing scientific methodology but inappropriate when making an analytical claim. Active constructions force you to commit to your argument in a way that passive constructions allow you to avoid. Essays that over-rely on passive voice often read as evasive, even when the argument itself is sound.

5

Register drift across the essay

Register is the level of formality in your writing. Academic register is not just about vocabulary — it includes sentence structure, the directness of claims, the way you refer to sources, and the presence or absence of colloquialisms. Register drift occurs when your essay starts at one level of formality and then — usually in the paragraphs you wrote when tired, or last, or in a rush — quietly becomes more casual.

✗ "Drifted: This policy clearly failed to account for the complexity of the situation. Essentially, the government got it wrong. The knock-on effects were pretty significant for the communities involved."
✓ "Consistent: This policy demonstrably failed to account for the complexity of the situation. The resulting implementation gaps had substantial and well-documented consequences for the communities directly affected."

Register drift is invisible to the writer because each sentence was composed in a particular moment and felt appropriate in that moment. It's visible to the reader — and to AI — because they can compare the tone of one section against another. A quick final read focusing only on register, not content, will catch most instances.

"Your essay just feels slightly difficult. Slightly unconfident. Slightly like it hasn't quite committed to its argument. These five patterns are almost always why."

Catching These Before Submission

The most reliable way to catch all five is a fresh read — after leaving the essay for at least a few hours — with a specific focus on each pattern in turn. Read once just looking for vague pronouns. Once just looking at your opening paragraph sentence. Once just listening for register. This is slow, but it works.

The faster method is to run your essay through RefineMyDraft before that final read. The AI feedback will annotate every instance of these patterns with an explanation of the specific issue and a suggested correction. You can then review the annotations, accept the ones that resonate, and apply the framework above to any that don't. The combination of AI annotation and your own editorial judgment is consistently more effective than either alone.

None of these mistakes reflect poorly on your intelligence or the quality of your thinking. They're almost entirely a product of composing under time pressure, reading your own work with a mind that already knows what you meant to say, and the natural informality that creeps in at the edges of a long writing session. They're solvable. And once you've been shown them in your own writing, you'll find them harder and harder to make without noticing.