一、definition
describe an habit or regular action from the past.we don't have that action or habit in the present.
common use
① habit in the past
② state in the past
二、affirmative form
Used + infinitive Used + infinitive Used + infinitive三、question form
Used + infinitive Used + infinitive四、common use
Used + infinitive Used + infinitive Used + infinitive五、excercises
Used + infinitive Used + infinitive Used + infinitive
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