Look at the sentences and choose the alternative. If you think two alternatives are
correct, mark both of them.
1 Usually, we has to/have to/don't have to go to
school on Monday.
2 You must/mustn't have to study hard to be a
doctor.
3 At our school we doesn't have to/don't have to/
mustn't wear a uniform.
4 You has to have to/must speak English in English
lessons if you want to speak well.
5 You mustn't must/don't have to break school
furniture.
6 Usually a student hasn't to/doesn't have to
don't have to use a computer to do exams.
Students must don't have to/mustn't hit each
other.​

1. Usually, we have to go to school on Monday.

Explanation: The correct alternative is "have to" because it expresses an obligation or requirement to go to school on Monday.

2. You must study hard to be a doctor.

Explanation: The correct alternative is "must" because it indicates a strong recommendation or necessity to study hard in order to become a doctor.

3. At our school, we don't have to wear a uniform.

Explanation: The correct alternative is "don't have to" because it shows the lack of obligation or requirement to wear a uniform at the school.

4. You have to speak English in English lessons if you want to speak well.

Explanation: The correct alternative is "have to" because it expresses the necessity or requirement to speak English in English lessons in order to improve language skills.

5. You mustn't break school furniture.

Explanation: The correct alternative is "mustn't" because it indicates a prohibition or a strong recommendation not to break school furniture.

6. Usually, a student doesn't have to use a computer to do exams.

Explanation: The correct alternative is "doesn't have to" because it states the absence of obligation or requirement for a student to use a computer while taking exams.

Students mustn't hit each other.

Explanation: The correct alternative is "mustn't" because it implies a strict prohibition against students hitting each other.