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'Could you...?' asks if someone is able to do something; 'would you...?' asks if they would be willing to.
Side-by-side comparison
"Could you...?" makes a polite request by asking about ability. It is the most common and natural option for everyday polite requests.
Could you review this paragraph and tell me if it sounds natural?
Could you open the window? It is very stuffy in here.
Could you watch my bag for a moment while I use the bathroom?
"Would you...?" sounds more formal and considerate. It asks about willingness, not just ability. Ideal for formal situations or when you want to be especially respectful.
Would you be able to help me move this sofa? It is much heavier than it looks.
Would you mind closing the door? We are trying to concentrate in here.
Would you like another cup of coffee, or shall I bring the bill?
Common mistake
- •"Can you send me the report?" in formal emails sounds too direct; use "Could you" or "Would you".
- •Never combine two modals or add "to" after one: "Would you can do this?" and "Could you to send?" are always incorrect.
Trick to remember it
- •Politeness scale: CAN (informal) < COULD (formal) < WOULD (very polite) < "Would you mind + gerund" (maximum politeness).
- •"Would you mind sending the report?" is the most diplomatic form.
Quick rule
- •"Could you" = can you? (standard politeness).
- •"Would you" = are you willing? (high politeness).
- •"Would you mind" + gerund = maximum politeness.
- •Never: modal + "to" + infinitive.
Did you know?
Indirect requests with modals are one of the most studied phenomena in English pragmatics. Linguists who study "speech acts", especially John Searle, documented that native English speakers rarely make requests directly in formal contexts. They use indirect forms that disguise the request as a question about ability or willingness, giving the listener the theoretical option of saying "no".
Practise what you learned
Exercise 1 · Pick the right one
"_____ you help me carry these bags? They are really heavy."
Exercise 2 · Pick the right one
"_____ you like a cup of tea?" (offering something to a guest)
Exercise 3 · Form the word
Related word pairs
'Can' expresses ability or possibility in the present; 'could' expresses past ability or hypothetical possibility.
'Could of' does not exist in correct English; the correct form is always 'could have' (could've).
'Should' and 'ought to' express advice or moral obligation with virtually the same meaning; 'should' is more common.
'Should have' expresses a past obligation not fulfilled; 'could have' expresses past capacity or possibility not acted upon.
Bryan López
Founder of SpeakUP Academy