4. Write the sentences in the a) negative; b) interrogative..
1. Ted used to go in for swimming.
2. He used to have problems with speak-
ing and especially pronunciation at his
English lessons.
3. Nick used to ride a motorbike very
well.
4. I used to like to get up early in the
morning.
5. The pupils used to wear a school uni-
form.
6. Her aunt used to keep to a diet.​

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a) Negative:
1. Ted didn't use to go in for swimming.
To form the negative in "used to", we add "didn't" before the verb phrase.
Explanation: The sentence states that previously, Ted used to participate in swimming as an activity. The negative form suggests that he no longer does so.

2. He didn't use to have problems with speaking and especially pronunciation at his English lessons.
Explanation: This sentence suggests that in the past, the person mentioned had difficulties with speaking and pronunciation during his English lessons. The negative form indicates that he no longer faces these issues.

3. Nick didn't use to ride a motorbike very well.
Explanation: This sentence implies that at some point in the past, Nick had the skill to ride a motorbike proficiently, but now he does not. The negative form suggests he lacks the ability to ride it well.

4. I didn't use to like to get up early in the morning.
Explanation: This sentence indicates that previously, the speaker had a dislike for waking up early in the morning. The negative form implies that the speaker now enjoys waking up early.

5. The pupils didn't use to wear a school uniform.
Explanation: This sentence suggests that in the past, the students used to wear a school uniform regularly, but now they do not. The negative form implies that they no longer follow this practice.

6. Her aunt didn't use to keep to a diet.
Explanation: This sentence implies that previously, her aunt used to follow a diet as a regular practice. The negative form suggests that she no longer adheres to this dietary habit.

b) Interrogative:
1. Did Ted use to go in for swimming?
Explanation: This sentence asks whether or not Ted used to participate in swimming as an activity. The interrogative form uses "did" before the subject and the base form of the verb.

2. Did he use to have problems with speaking and especially pronunciation at his English lessons?
Explanation: This sentence inquires whether the person mentioned used to struggle with speaking and pronunciation during his English lessons. The interrogative form uses "did" before the subject and the base form of the verb.

3. Did Nick use to ride a motorbike very well?
Explanation: This sentence asks if Nick used to possess good riding skills on a motorbike. The interrogative form uses "did" before the subject and the base form of the verb.

4. Did I use to like to get up early in the morning?
Explanation: This sentence inquiries about the speaker's past preference for waking up early in the morning. The interrogative form uses "did" before the subject and the base form of the verb.

5. Did the pupils use to wear a school uniform?
Explanation: This sentence asks whether or not the students used to wear a school uniform regularly. The interrogative form uses "did" before the subject and the base form of the verb.

6. Did her aunt use to keep to a diet?
Explanation: This sentence inquires whether her aunt used to follow a diet as a regular practice. The interrogative form uses "did" before the subject and the base form of the verb.