I. Talking about past habits:
We use 'used to' to talk about past habit which we don't do in the present.
Used to + infinitive (verb1):
1. I used to drink coffee (I had a habit of drinking coffee, but I don't drink coffee now).
2. I used to play volleyball (Playing volleyball was my past habit. I don't play volleyball now).
Negative sentence:
Subject + didn't use to + infinitive:
1. I didn't use to smoke. (I didn't have a habit of smoking).
2. I didn't use to ride in the city.
Question:
1. Did you use to wake up early in the morning?
2. Did you use to meet him?
II. Talking about present habits:
Subject + infinitive (verb1):
1. I play football in the evening.
2. I go to bed at 10 o'clock every day.
Negative sentence:
Subject + doesn't / don't + infinitive (verb1):
If the subject is singular (he, she, it) use 'does' and if it is plural(I, you, we, they), use 'do':
1. I don't drink coffee:
2. He doesn't eat non vegetarian food.
Question:
1. Do you go there every day?
2. Does she read newspaper every day?