Providing that it is grammatically correct, "used" acts like a modal verb here. Take the verb "need" for example: You needn't make your bed. or You don't need to make your bed.
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Mister MicawberIt just reflects its position as a marginal modal. The negation is as with others of its group:How can "used to" be descibed as a (marginal) m
I dare not play
I ought not to play
I need not play
I used not to play
You will note that all of these verbs have various forms of variable respectability.
Mister MicawberIt shares their variety of form and contestable grammatical justification.I contest!
Mister MicawberIt shares their variety of form and contestable grammatical justification.So, should we write the tag form as:
CalifJimGrammatical justification? What is it?
What form would a grammatical justification take?
The presence of thousands of instances of it, as on Google? No, I don't think that's what you mean.
An analysis of what part of speech each of the words is? No, I don't think that's what you mean.
Maybe you mean something closer to
I - subject
u
Milky
Let's say an adult native English speaker wants to use this sentence when speaking to another native English speaker, "The flowers reds, please.". He/she may be asked to justify why he/she has chosen to use such a form as "flowers reds". He/she may be told that there is no justification for using such a form in any variety of English. If he asks why there is no