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对于不再成立的过去习惯或状态，使用 "used to" + 动词原形。它不用来描述单一的过去动作，只用于描述重复发生或持续较长时间的事情。
I used to went there every summer.
I used to go there every summer. — 在 "used to" 之后使用动词原形。
I usedn't to like coffee.
I didn't use to like coffee. — 使用 "didn't use to"，而不是 "usedn't to"。
used to smoke
Did you use to live here?