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The checker applies a sequence of passes over your text, each targeting one class of error, and records every change it makes as it goes.

The spelling pass matches words against a dictionary of common misspellings and their corrections, so accomodate becomes accommodate and definate becomes definite. The contraction pass restores missing apostrophes in forms that are not themselves real words, which is why dont and wouldnt are fixed while ambiguous cases such as were and cant are deliberately left alone rather than risking a wrong guess.

A phrase pass rewrites set errors and wordy constructions: could of to could have, more better to better, anyways to anyway, due to the fact that to because. A repeated-word pass finds any word immediately duplicated and drops the second copy. An article pass switches a to an before vowel sounds and back again before consonant sounds, with exception lists so a university and an hour stay correct. Final passes normalise spacing around punctuation, collapse double spaces and capitalise the first word of each sentence.

Identical issues are then grouped together with a count, so one error repeated six times appears once.

Take this sentence: i dont think we could of finished the the report in a hour , and its definately a a good result .

The capitalisation pass raises the opening i to I. The contraction pass fixes dont to don't. The phrase pass rewrites could of to could have. The repeated-word pass finds two duplications, the the and a a, and removes the second copy of each. The article pass changes a hour to an hour, since hour begins with a silent h and takes an. The spelling pass corrects definately to definitely, and the spacing pass removes the space before the comma and before the full stop.

The corrected output reads: I don't think we could have finished the report in an hour, and it's definitely a good result.

The issue list would show these grouped by type: one capitalisation, one punctuation for the apostrophe, one grammar entry for could have, a repeated word entry covering both duplications with a count, one grammar entry for the article, one spelling entry, and spacing corrections. The word count of the original and the total issue count appear above the result.

Read the corrected text rather than accepting it blindly. The highlighted diff exists so you can approve each change: insertions and deletions are marked, and the issue list explains the reasoning behind each one.

The important limit is that these are pattern rules, not an understanding of your sentence. The checker cannot tell you that a sentence is ambiguous, that a paragraph contradicts the previous one, or that a technical term is wrong in context. It will not catch a correctly spelled word used in the wrong place, such as their for there in a construction its rules do not cover, and it does not attempt subject-verb agreement or tense consistency across a passage.

Some cases are left untouched on purpose. Ambiguous contractions are skipped because guessing would introduce errors, and style suggestions such as shortening in order to are flagged as suggestions rather than errors because they are sometimes the better choice. Proper nouns, deliberate dialect, creative writing and quoted material may all be flagged wrongly, so keep the original if the change would alter someone's actual words. Text longer than roughly 2,500 words needs to be checked in sections.