The Comprehensive Diagnostic Quiz

This is not a test, and nobody is scoring it. Think of it as a quick sweep across the whole library — a set of small "can I do this?" questions that help you spot which corners are worth a closer look. Read each one and answer honestly in your head: yes, easily / sort of / no idea. Wherever you land on "sort of" or "no idea", follow the route to the article that fixes it. Nothing here is a mark against you — it is just a map of where to go next. If lots of them wobble, don't worry: start at The Walk-In Clinic and take them one at a time.

Sentences

• Can you tell a complete sentence from a fragment — does "Because it was raining." stand on its own? (No — it's a fragment.)
• Do you know why "It was late, we went home." is wrong, and three ways to fix it? → Fragments, Run-Ons & Comma Splices
• Can you make the verb match the subject in "The box of toys (is / are) heavy"? (is)

Punctuation

• Do you know when a comma is needed and when it is just slowing the sentence down?
• Can you place an apostrophe correctly in "the dogs bowls" when there are two dogs? (the dogs' bowls)
• Do you know the difference between a colon and a semicolon, and when to reach for each?
• Can you punctuate speech — where the comma and the full stop go inside the quotation marks?

Words that swap

• its or it's in "The cat licked (its / it's) paw"? (its)
• their, there or they're — can you place all three without stopping to think?
• fewer or less: "(fewer / less) chairs"? (fewer — you can count chairs)
• affect or effect in "Did the rain (affect / effect) the game?" (affect)

Verbs and time

• Can you keep one tense through a whole paragraph without hopping past-to-present?
• Do you know when to use the present perfect ("I have finished") rather than the plain past ("I finished")?
• Can you spot a wandering tense in your own writing when you read it back?

Spelling and style

• Do you spell consistently in one variety — all British -our (colour) or all American -or (color), not a mix?
• Do you know whether your school wants -ise or -ize endings?
• Can you tell when a piece sounds too stiff, and loosen it without breaking any rules?

Capitals and titles

• Can you say which words in "the lord of the rings" need a capital, and which stay small? (Capitals on Lord, Rings; small the, of, the.)
• Do you always capitalise names, places, days, months and the word I?
• Can you tell when a capital is just for show and should not be there — "I love Football and Pizza"? (Neither needs one.)

Meaning and reading

• When you read a tricky sentence back, can you tell whether it actually says what you meant?
• Can you spot a sentence that could be read two ways, and reword it so there is only one?
• If a paragraph feels muddled, can you find the sentence that is out of order and move it?

Everyday writing

• Can you write a short, polite message that sounds like a real person, not a robot?
• Do you know when a piece is too stiff — full of "I would be most grateful if" — and how to warm it up?
• Can you match your writing to your reader: chatty for a friend, tidier for a teacher?

Joining and connecting

• Can you join two short sentences smoothly with and, but, so or because, instead of leaving them to bump along separately?
• Do you know when to start a new sentence rather than stretching one with comma after comma?
• Can you use a linking word like however, therefore or although in the right spot, with the right punctuation around it?
• When two of your sentences say almost the same thing, can you spot it and cut one?

What to do with your answers

Count nothing. Instead, notice the pattern: if your wobbles cluster in one section — say, punctuation, or the swapping words, or joining sentences — that is the corner to spend an afternoon on, and the links above take you straight there. A "no idea" is not bad news; it is simply the next useful thing to learn, and a "sort of" often just means you know the rule but have not practised it enough to trust it yet.

You do not have to fix everything at once, and you certainly do not have to be good at all of it today. Pick the one section that wobbled most, learn it properly, and let the rest wait — a single corner sorted is worth more than a vague worry about the whole lot. Grammar is learned the way you learn anything: one clear piece at a time, until the piece you once had to think about becomes the piece you just do.

Come back to this sweep now and then. The questions that felt shaky in September often feel obvious by the spring — and that quiet progress, more than any score, is the thing worth noticing. Keep the page bookmarked, run it whenever a big piece of writing is coming up, and let it point you, each time, at the one thing most worth a closer look.

Where next

• Reference — the young-learner shelf — every quick-guide in one place
• The Walk-In Clinic — match a symptom to its fix
• Top 20 Common Errors Checklist — the slips worth a final scan
• Fragments, Run-Ons & Comma Splices — the sentence-boundary fixes