Readability, Grammar & Punctuation

What you'll learn: the small set of grammar and punctuation habits that most affect CELPIP readability scores, and how to catch them without a spell-checker.

What readability rewards

Readability isn't about complex sentence structure — it's about whether a reader can understand each sentence on a single pass. A response with simple, correct sentences scores higher on readability than one with ambitious but broken sentences.

The five highest-impact errors

1. Run-on sentences — two full ideas joined with no punctuation or connector. Fix by splitting into two sentences or adding a connector ("and," "but," "so").
2. Subject-verb agreement — "the reasons is" instead of "the reasons are." Reread the subject right before checking the verb.
3. Missing articles — "I have request" instead of "I have a request." Common when a first language doesn't use articles.
4. Comma splices — joining two full sentences with only a comma: "I called the office, they didn't answer." Fix with a period, semicolon, or connector.
5. Verb tense drift — switching between present and past mid-response without reason.

Worked example

Before: "I am writing about the delivery, it was three days late and this cause a lot of problem for me because I needed for a event."

After: "I am writing about the delivery, which was three days late. This caused a significant problem for me, because I needed the package for an event."

Fixes applied: comma splice → relative clause + period, tense error (cause → caused), missing article (a problem, an event).

A 90-second self-edit routine

With roughly the last 2 minutes of your time, reread your response once, checking only for these five errors — not for style. Reading purely for errors (not meaning) catches more mistakes than a general reread.

• Any sentence with two "ideas" and no clear connector? → split or connect properly
• Does every subject match its verb?
• Any missing "a/an/the" before a countable noun?
• Any comma joining two full sentences?
• Is the tense consistent throughout?

Common mistakes

• Trying to fix everything in a final read instead of targeting the five highest-impact errors.
• Adding complex sentence structures under pressure, which raises the chance of a new error.
• Skipping the self-edit routine entirely because time feels tight — even 90 seconds catches real errors.

Recap

Readability is won or lost on a handful of common, fixable errors — run-ons, subject-verb agreement, missing articles, comma splices, and tense drift. A short, targeted self-edit pass at the end of your response catches most of them before submission.