When we want to say that something was NOT true in the past, we use ‘didn’t use to’ + base verb. Notice that ‘used’ becomes ‘use’ (without ‘d’) in negative sentences. This structure helps us talk about past habits or states that did not exist before, but may be different now.

Look at these examples:

• I didn’t use to like vegetables, but now I eat them every day.
• They didn’t use to live in the city.
• He didn’t use to exercise regularly.

The key point is that ‘didn’t use to’ tells us about something that was NOT part of our past, often with an implied contrast to the present.

The structure is: Subject + didn’t use to + base verb

Breaking it down:

• Subject: I, you, he, she, it, we, they
• didn’t use to: the negative form (NOT ‘didn’t used to’)
• Base verb: the infinitive without ‘to’ (like, go, have, be, etc.)

Examples with different subjects:

• I didn’t use to drink coffee before I started working.
• You didn’t use to wear glasses.
• She didn’t use to speak Spanish, but now she’s fluent.
• We didn’t use to travel much when we were younger.
• They didn’t use to have smartphones in the 1990s.

Remember: The auxiliary ‘did’ already shows past time, so we use ‘use’ (not ‘used’).

We use ‘didn’t use to’ in several typical situations:

1. Talking about past habits that didn’t exist:

• I didn’t use to exercise, but now I go to the gym three times a week.
• She didn’t use to eat breakfast before school.

2. Describing past states or situations that weren’t true:

• This area didn’t use to be so crowded.
• He didn’t use to be so confident.

3. Contrasting past and present:

• We didn’t use to have a car, so we took the bus everywhere.
• I didn’t use to understand grammar, but this course is really helping.

4. Talking about abilities or skills we lacked:

• They didn’t use to know how to swim.
• I didn’t use to speak English very well.

5. Describing past preferences:

• My brother didn’t use to like reading, but now he reads every night.
• We didn’t use to enjoy spicy food.

In spoken English and informal writing, we almost always use the contraction ‘didn’t’ instead of ‘did not’.

Formal: I did not use to enjoy mathematics.
Informal/Spoken: I didn’t use to enjoy maths.

The full form ‘did not use to’ sounds very formal and is rarely used in everyday conversation. For B1 learners, focus on using ‘didn’t use to’ as this is the natural form you’ll hear and use most often.

Didn’t use to vs. Used to (positive):

• Used to = something WAS true in the past
• Didn’t use to = something WAS NOT true in the past

Example: I used to play football (I played before, but not now).
Example: I didn’t use to play football (I never played before, but maybe I do now).

Didn’t use to vs. Simple Past Negative:

• Didn’t use to = a repeated habit or state that wasn’t true
• Simple Past Negative = a specific action or event that didn’t happen

Example: I didn’t use to drink tea (general habit over time).
Example: I didn’t drink tea yesterday (specific occasion).

Didn’t use to vs. Would (negative):

• Both can describe past habits, but ‘wouldn’t’ is less common for negatives
• ‘Didn’t use to’ is more natural for negative habits

Example: I didn’t use to visit my grandparents often. (natural)
Example: I wouldn’t visit my grandparents often. (sounds like refusal, not habit)

Personal Changes:

• I didn’t use to be interested in history.
• She didn’t use to care about fashion.
• They didn’t use to worry about money.

Lifestyle Changes:

• We didn’t use to eat out very often.
• He didn’t use to stay up late.
• I didn’t use to cook my own meals.

Technology and Modern Life:

• People didn’t use to have mobile phones everywhere.
• We didn’t use to shop online.
• Children didn’t use to spend so much time on screens.

Relationships:

• They didn’t use to talk to each other much.
• We didn’t use to see our neighbors very often.
• I didn’t use to get along with my sister.

Skills and Knowledge:

• I didn’t use to know how to drive.
• She didn’t use to understand computers.
• We didn’t use to speak any foreign languages.