4.1.2 Explicar el porqué de las obligaciones
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"Must" and "Have to" express an obligation. Sometimes be used interchangeably (especially with the first person which practically have the same direction), however there are some differences.
"Must" is used with the present and future. "Have to" is used with past, present and future.
"Must": issuer imposes an obligation. "Have to": the issuer does not impose any obligation merely informs an obligation owed.
(Teacher)You must do your homework(Professor imposes a duty to do homework). (Student) I have to do my homework (the student merely informs an obligation has been imposed). You must stop making noises (The teacher instructs students). You have to stop smoking (She reminds her husband an obligation imposed on it by the doctor). I can’t stay longer, I have to go home (my family obligations force me to go home).
"Must" can also be used to express a council emphatically.
See the difference between: You should stop smoking. You must stop smoking.
In both cases it is not an obligation but a council . With "must" is more emphatic advice.
Interrogative Form.
Must + subject + main verb? Do + subject + have to + main verb?
Must you leave now? Doyou have to leave now?
Negative Form.
When the sentence also is negative, the meaning of these two verbs is different: "Mustn’t" not to do something. "Don’t have to" do not need to do anything.
Examples: You mustn't go to that meeting. You don't have to go to that meeting.
To learn the difference between:
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