"Used to" sounds like a reference to a more indefinite past to me. I would use it with adverbial phrases such as " long ago", "some time ago" or "when I was a child". For example, "A few years ago I used to smoke, but I no longer do." Is it still acceptable to use "used to" with more definite time reference, e.g. "Five years ago I used to smoke"? Wouldn't you use Simple Past Tense in this sentence instead: "Five years ago I smoked." — This comment was unsigned.
In the usage notes, there is to be found the following: "didn't used to (the latter is considered by many grammatically to be wrong)"
The placement of the adverb here before the to + verb construction seems, to my ear, rather odd. Wouldn't it sound more natural to place grammatically at the very end of the clause?
More to the point, is there any known guidance as to this positioning of the adverb? Shouldn't the word grammatically, when placed as above, lie within commas?
"Used to" is a verb phrase; "formerly" is an adverb. You cannot simply translate one with the other, though you can probably always use "formerly" as part of the translation. "I used to do this" = "I formerly did this". (In writing this, I'm interested to note that "formerly" here implies something habitual). Koro Neil (talk) 22:26, 1 February 2017 (UTC)
Surely the correct one is did use to...? --Backinstadiums (talk) 12:22, 28 February 2020 (UTC)
Page 496 of Collins Cobuild English Usage reads
You form 'yes/no'-questions by putting did in front of the subject, followed by use to: Did you used to play with your trains? If the 'wh'-word is the object of the clause, or part of the object, you use the auxiliary do after it, followed by the subject and used to: What did you used to do on Sundays?
However, I do not know why used is compulsory in wh-questions, unlike in yes/no-questions. https://oed.com/oed2/00273881 --Backinstadiums (talk) 18:28, 25 August 2020 (UTC)
✳had used to be is unidiomatic in place of had (once) been --Backinstadiums (talk) 15:04, 3 September 2021 (UTC)
Temporary or repeated states are allowed with would so we encounter:
She would get irritable if I asked too many questions She would often be found in the garden
Permanent states are not allowed with would so we do not encounter:
*She would be an impatient person
although
She would get impatient
is allowed because the state is temporary.
In the negative and interrogative forms would is often avoided in favour of used to because to many:
I wouldn't get up early when I was on holiday
and
Would you often have lunch on the terrace?
sound stilted.
What both verbs are doing is signalling that a verb is to be considered both past and habitual in aspect.
https://www.eltconcourse.com/training/inservice/modality/semimodals.html#2 JMGN (talk) 18:45, 19 August 2023 (UTC)
She used frequently to start early or She frequently used to start early JMGN (talk) 23:07, 18 October 2023 (UTC)