used to
EN
[juːs(t).tu] [juːs(t).tə] 
US - Verb
- (temporal location) Formerly, and habitually or repeatedly, but possibly no longer.
- I used to be undecided, but now I’m not so sure. I used to like that band and I still do. I used to know a guy from the UK who pronounced "mother" without the "r". It used to be me, sitting in that chair. There used to be open fields here. Now it's a shopping mall.
- (temporal location) Formerly, and habitually or repeatedly, but possibly no longer.
- Adjective
- IDI (with noun phrase) Accustomed to, tolerant or accepting of.
- I am used to cleaning up other people’s mess. I became used to his ways.
- IDI (with noun phrase) Accustomed to, tolerant or accepting of.
- More Examples
- Used in the Middle of Sentence
- He's so hot. I used to fantasise about him constantly.
- The Kaplan-Meier method, log-rank testing, and Cox proportional hazards regression models were used to analyze the associations between immunosignals and outcome.
- He used to live in that town, and he still knows all the streets by heart.
- Used in the Ending of Sentence
- Editors of newspapers allow more vulgarisms to go to print today than they used to.
- Used in the Middle of Sentence
Definition of used to in English Dictionary
- Part-of-Speech Hierarchy
- Phrases
- Non-constituents
- Phrasal verbs
- Phrasal verbs with particle (to)
- Phrasal verbs with particle (to)
- Non-constituents
- Adjectives
- Uncomparable adjectives
- Uncomparable adjectives
- Adverbs
- Time adverbs
- Temporal location adverbs
- Temporal location adverbs
- Time adverbs
- Verbs
- Phrasal verbs
- Phrasal verbs with particle (to)
- Phrasal verbs with particle (to)
- Phrasal verbs
- Phrases
Other Vocabulary
Source: Wiktionary
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Grammatically, this idiom "used to" is a phrase, more specifically, a non-constituent and a phrasal verb. It's also an adjective, more specifically, an uncomparable adjective. It's also an adverb, more specifically, a time adverb. It's also a verb, more specifically, a phrasal verb.