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English definition of “do”

do

auxiliary verb
 
strong /duː/
 
strong /duː/
 
weak // (doing, did, done)
A1 used with another verb to form questions and negative phrases: Do you need any help? I don’t know.
A2 used at the end of a sentence to make it into a question: Sarah lives near here, doesn’t she?
B1 used to avoid repeating a verb that has just been used: “I hate that song.” “So do I.”
used to make the main verb stronger: He does like you – he’s just shy.
(Definition of do auxiliary verb from the Cambridge Essential Dictionary © Cambridge University Press)
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