Learner holds one level of certainty across a paragraph, and changes it only where the argument changes.
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Six paragraphs. Two shift for good reasons.
Charges will cut congestion. They should reduce journeys by a fifth. They might help air quality too. Some effect may be visible. Where does it shift?
The reader tracks it, two legitimate changes, and the backwards case.
A paragraph that opens with will and closes with might reads badly.
The writer appears to be talking themselves out of their own claim.
Nothing in it is ungrammatical.
The reader simply cannot tell, at the end, what you believed.
Ten paragraphs. Four are correct, and two of those change stance.
Sort each item into the correct category
Four paragraphs with drifting stance. Adjust two sentences in each.
A. Charges will cut congestion. (1) They should reduce journeys by about a fifth. (2) They might help air quality too. Level chosen: 1 → They reduce journeys by about a fifth. 2 → They help air quality too.
B. Charges may possibly cut congestion. (1) Four cities measured a fifth fewer journeys within two years. (2) The effect might therefore be real. The topic sentence is the problem. Restate it: 2 → The effect therefore real.
C. Remote work harms junior training. (1) It may reduce the informal learning juniors rely on. (2) It cuts the time seniors spend nearby. Level chosen: 1 → It the informal learning juniors rely on.
D. Free transport is likely to raise usage. (1) It will certainly cut car journeys. (2) It may perhaps reduce emissions slightly. Level chosen: 1 → It cut car journeys. 2 → It reduce emissions.
One level throughout, with one deliberate change at a concession.
Topic: whether free public transport reduces car use.
Box 1: name the certainty level you are writing at — certain, expected, probable, or possible. Box 2: four sentences at that level, with one deliberate shift where you concede something.
The shift should be visible as a concession, not as a loss of nerve.
One word or phrase.
One concession among them.
Does your last sentence sound as sure as your first?