4.261 negatives

'Used to' is not common in negative structures.

In informal speech, people sometimes make negative statements by putting 'didn't' in front of 'used to'.

However, many people consider this use to be incorrect.

Another way to form the negative is to put 'never' in front of 'used to'.

Sometimes 'not' is put between 'used' and 'to'. This is a fairly formal use.

Some grammar books give a contracted form for the negative, 'usedn't to' or 'usen't to'. This is now rarely used, and is thought to be very old-fashioned.