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I ‘d like to know which one is used with laws and rules  and which one isn’t obligatory.       *I (must -have to)follow the necessary precautions to avoid  covid19.    Which one is more obligatory.   *he (must-has to) take his medicine. How can I teach the difference to my secondary school students?

Last edited by safaa ali
Original Post

Hi, Safaa, and welcome to the G.E,

@safaa ali posted:

I ‘d like to know which one is used with laws and rules  and which one isn’t obligatory.       *I (must -have to)follow the necessary precautions to avoid  covid19.    Which one is more obligatory.   *he (must-has to) take his medicine. How can I teach the difference to my secondary school students?

See this link: https://thegrammarexchange.inf...opic/have-to-vs-must

Also, see here: https://thegrammarexchange.inf...opic/must-vs-have-to

1. I (must -have to)follow the necessary precautions to avoid  covid19.

'Must' here works better because it shows the idea of 'internal obligation'. It is important for my own health. Also, 'must' is much stronger than 'have to' here.

2. He (must-has to) take his medicine.

I see both work here. 'Has to' shows that taking his medicine is his only choice. He has no other choice as his case is urgent or the doctor insists on it.

'Must' reflects my strong opinion here. I insist that he take his medicine. It could also be emphatic advice.

 

Last edited by ahmed_btm

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