curriculum/challenges/english/blocks/learn-how-to-talk-about-a-typical-workday-and-tasks/657e3dfda31b534042d06e39.md
Must and have to express obligation. Must is often used for strong personal or internal obligations, while have to is more for external requirements or rules. For example:
I must finish this report because it's important to me. - Here, the obligation comes from the speaker's own feeling or decision. The person chooses to make it important.
I have to finish this report by 5 PM because my boss said so. - Here, the obligation comes from an external rule or authority. The boss sets the deadline, so it is not the speaker's personal choice.
This difference helps show whether the obligation is internal (from yourself) or external (from outside, like rules or instructions).
Which sentence correctly uses must or have to?
I must monitor the entrances because it's a company rule.
Company rules suggest an external obligation, more suited to have to.
I have to make sure the security cameras work because I believe it's crucial.
A personal belief about importance aligns more with must.
I must avoid sharing my password with other people as part of the company's security policy.
This is a requirement from the company, and aligns more with have to.
I have to check the security cameras as part of my job duties.
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