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'Used to' is one of the most useful phrases in English, and it is even easy to pronounce. English learners often get confused when they try to substitute a phrase from their own language:
English Learner: Last time, I smoked a lot.
English Learner: I smoked a lot, but now, no.
Native Speaker: I used to smoke a lot.
Here's a word of warning. There are two forms of 'used to' in English and they both have different meanings and grammatical structures:
Example 1: I used to be a policeman.
Example 2: I am used to eating spicy food.
In example 1, the meaning is 'in the past, but not now'. In example 2, the meaning is 'familiar with'.

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