Must is used to express obligation, give orders or advices.
And the difference of don't and doesn't is that don't is used when speaking in the first and second person plural, singular and the third person plural.
For example: I don't and They don't
While doesn't is used when speaking in the third person singular only.
Answers & Comments
1. mustn't
2. mustn't
3. don't
4. doesn't
5. doesn't
hope it helps, correct me if may mali ahee^^
pa-brainliest
Answer:
1. mustn't
2. mustn't
3. don't have to
4. doesn't have to
5. mustn't
Explanation:
Must is used to express obligation, give orders or advices.
And the difference of don't and doesn't is that don't is used when speaking in the first and second person plural, singular and the third person plural.
For example: I don't and They don't
While doesn't is used when speaking in the third person singular only.
For example: She doesn't and It doesn't
Hope it helps ^0^