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If something used to /juːs tuː, juːs tə/ happen, it happened regularly in the past but does not happen now. Similarly, if something used to be true, it was true in the past but is not true now.
In conversation, you can say that something didn't use to happen or didn't use to be true.
Many people use the form didn't used to instead of didn't use to. However, some people think that this use is incorrect.
You can also say that something never used to happen or be true.
You can also say that something used not to happen or be true. This is a fairly formal use.
In standard English you don't say that something 'usedn't to' happen or be true.
You form yes/no-questions with used to by putting did in front of the subject, followed by use to.
Many people use the form used to instead of use to in questions. However, some people think that this use is incorrect.
Used to can also be used in wh-questions. If the wh-word is the subject of the clause, or part of the subject, you put used to after it, without an auxiliary verb.
If the wh-word is the object of the clause, or part of the object, you use the auxiliary verb do after it, followed by the subject and used to.
Used to has another meaning. If you are used to something, you have become familiar with it and you accept it. With this sense, used to is preceded by the verb be or get, and is followed by a noun or an -ing form.
|Adj.||1.||used to - in the habit; "I am used to hitchhiking"; "you'll get used to the idea"; "...was wont to complain that this is a cold world"- Henry David Thoreau|
accustomed - (often followed by `to') in the habit of or adapted to; "accustomed to doing her own work"; "I've grown accustomed to her face"