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Problem Explanation and Solution

The worksheet focuses on the correct usage of "have to" and its variations (has to, had to) in English grammar. Let's solve each section step by step.

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Section A: Choose the correct word

The task is to choose between "has to" and "have to" based on the subject of the sentence. The rule is:
- Use "has to" with singular subjects (e.g., he, she, it, my brother).
- Use "have to" with plural subjects (e.g., we, they) or with the pronoun I.

#### Solutions:
1. She has to / have to wear glasses because she can't see very well.
- Subject: She (singular)
- Correct: has to

2. My uncle is a police officer. He has to / have to wear a uniform.
- Subject: He (singular)
- Correct: has to

3. My dad has to / have to wash the car every Saturday.
- Subject: My dad (singular)
- Correct: has to

4. We has to / have to cook dinner now.
- Subject: We (plural)
- Correct: have to

5. Now they has to / have to go to school.
- Subject: They (plural)
- Correct: have to

6. Lily and Danny has to / have to go to work every day.
- Subject: Lily and Danny (plural)
- Correct: have to

7. Sarah has to / have to make a phone call now.
- Subject: Sarah (singular)
- Correct: has to

8. I has to / have to get up very early every morning.
- Subject: I (singular, but uses "have to")
- Correct: have to

9. My brother has to / have to go to school on time. His teacher is a strict man.
- Subject: My brother (singular)
- Correct: has to

10. I has to / have to go to the dentist because my teeth hurt.
- Subject: I (singular, but uses "have to")
- Correct: have to

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Final Answers for Section A:

1. She has to wear glasses because she can't see very well.
2. My uncle is a police officer. He has to wear a uniform.
3. My dad has to wash the car every Saturday.
4. We have to cook dinner now.
5. Now they have to go to school.
6. Lily and Danny have to go to work every day.
7. Sarah has to make a phone call now.
8. I have to get up very early every morning.
9. My brother has to go to school on time. His teacher is a strict man.
10. I have to go to the dentist because my teeth hurt.

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Section B: Complete the sentences

The task is to choose the correct form of "have to": have to, had to, or has to. The choice depends on the tense of the sentence:
- Present tense: Use have to or has to.
- Past tense: Use had to.

#### Solutions:
1. Yesterday I ………… go home from school early because I was ill.
- Tense: Past tense
- Correct: had to

2. We are going to be late. Sorry, we ………… go now.
- Tense: Present tense (indicating immediate necessity)
- Correct: have to

3. I was at the movie theater early, so I ………… wait.
- Tense: Past tense
- Correct: had to

4. My little sister ………… do homework every day.
- Tense: Present tense (routine action)
- Correct: has to

5. Leo is at the red light. He ………… stop.
- Tense: Present tense (immediate necessity)
- Correct: has to

6. She ………… go back to the traffic lights five minutes ago.
- Tense: Past tense
- Correct: had to

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Final Answers for Section B:

1. Yesterday I had to go home from school early because I was ill.
2. We are going to be late. Sorry, we have to go now.
3. I was at the movie theater early, so I had to wait.
4. My little sister has to do homework every day.
5. Leo is at the red light. He has to stop.
6. She had to go back to the traffic lights five minutes ago.

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Summary of Answers:

#### Section A:
1. has to
2. has to
3. has to
4. have to
5. have to
6. have to
7. has to
8. have to
9. has to
10. have to

#### Section B:
1. had to
2. have to
3. had to
4. has to
5. has to
6. had to

Final Answer:
```plaintext
Section A:
1. has to
2. has to
3. has to
4. have to
5. have to
6. have to
7. has to
8. have to
9. has to
10. have to

Section B:
1. had to
2. have to
3. had to
4. has to
5. has to
6. had to
```