did/do

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wowenglish1

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I would like to know the difference between "1" and "2"
1. Do you know you were speeding?
2. Did you know you were speeding?
 
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It's a simple question of tense: 'Do you know' is present tense and 'did you know' is past perfect tense. So, 1. might be used to ascertain whether the person who was speeding is currently aware of what he had done, and 2. might be used when the question is asked some time further on from the offence. Having said all that, no.2 sounds better to me because there are no mixed tenses.
 

riverkid

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I would like to know the difference between "1" and "2"
1. Do you know you were speeding?
2. Did you know you were speeding?


A policeman walking up to a stopped vehicle's window could ask either way. That policeman would not be referring to another time, another speeding incident so obviously there is something else afoot.

It's an issue of tense FORM. Using the past tense FORM, 'did' is simply not as direct a question, not as confrontational a question.
 
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