What is the past participle of the verb form "used to"? - It doesn't exist. I used to live in a small town.
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SJ88Does that mean that you can't use it when you are supposed to be using the past participle, or that you just use "used to" whether or not its in the past or past participle?"Used to" is verb idiom. That's all that matters. Situation have been described above. It is used as an auxiliary to express habitual or accustomed actions, states, etc.,
SJ88Does that mean that you can't use it when you are supposed to be using the past participle, or that you just use "used to" whether or not its in the past or past participle?Used to is used in the past tense only. For other tenses other expressions are needed. For example: