двуличные глаголы CAN - MUST. и пара слов про SНOULD

[1way_to_english]

я их так называю, потому что от can происходят два разных COULD:

1) МОГ в прошедшем времени. полноценно мог, на 100% и

2)

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двуличные глаголы CAN - MUST. и пара слов про SНOULD

[livejournal]

User vala77 referenced to your post from двуличные глаголы CAN - MUST. и пара слов про SНOULD saying: [...] Оригинал взят у в двуличные глаголы CAN - MUST. и пара слов про SНOULD [...]

[english_in_song]

Must and to have to ain't exactly the same you know.

"Have to shows us that the obligation comes from somebody else. It’s a law or a rule and the speaker can’t change it.

Do you have to wear a uniform at your school?
John can’t come because he has to work tomorrow.
In Britain you have to buy a TV licence every year.

Must shows us that the obligation comes from the speaker. It isn’t a law or a rule.

I must call my dad tonight.
You must hand in your homework on Tuesday or your mark will be zero.
You must come and visit us the next time you come to London."

https://learnenglish.britishcouncil.org/en/quick-grammar/modals-1