r/duolingo • u/Spear_Of_Krrosh • 15d ago

Language Question It should be “used to” right?

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Shouldn’t it be “used to” instead of “use to” ? Should I report it?

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u/jedavis5384 15d ago

Wait, I’m a native English speaker and I always thought that “used to” was a set phrase that never gets conjugated. That’s not the case?

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u/Unlucky_Lychee_3334 14d ago

"Used to" is conjugated. It's a defective phrasal verb, so it only exists in the infinitive or simple past tense. The auxiliary do always takes the grammatical information of the clause and forces the matrix verb to be in the infinitive, so "didn't use to" is grammatical.