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Could you please, check if the answers given for each sentence are correct?

1) I think he is Irish. * I am not sure.

Here when I say “I think he is Irish”, it’s my deduction. So If I had to replace it by a modal auxiliary I would use must .O.K.? But then, as I say that “I am not sure” so should I use “might” instead of must ? I am a little bit confused about this matter. So, what’s the correct option below?

a) He must be Irish. (* I am not sure).

b) He might be Irish. (* I am not sure).

2)It’s extremely necessary that Ursula goes home right now.

In this case, I suppose the correct answer is:

Ursula must go home right now (or) Ursula has to go home right now.

3) He is prohibited from saying four-letter words in this place.

Here I suppose the answers are:

He musn’t say four-letter words in this place (or) He can’t say four-letter words in this place.
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AnonymousI think he is Irish. * I am not sure.
He might be Irish. He may be Irish. He could be Irish.
AnonymousIt’s extremely necessary that Ursula goes home right now.
Ursula has to go home now. Ursula must go home now.
Anonymous He is prohibited from saying four-letter words in this place.
He may not say .... He cannot say .... (He must not say ....)
CJ
American English
It's possible that ... = might [Also may, sometimes could] / He might be ready.
The only conclusion is that ... = must [Also, sometimes, has to] / He must be ready.

... has permission to ... = can [Often also may] / He can leave.
... has the obligation to ... = has to [Also, sometimes, must] / He has to leave.

It's possible that ... not ... = might not [Also may not] / He might not be ready.
The only conclusion is that ... not ... = must not [Also, very often cannot, can't] / He must not be ready.

... does not have permission to ... = cannot, can't [Also may not] / He can't leave.

... does not have the obligation to ... = doesn't have to [Also need not] / He doesn't have to leave.

CJ
Comments  
AnonymousCould you please, check if the answers given for each sentence are correct?



1) I think he is Irish. * I am not sure.



Here when I say “I think he is Irish”, it’s my deduction. So If I had to replace it by a modal auxiliary I would use must .O.K.? But then, as I say that “I am not sure” so should I use “might” instead of must ? I am a little bit confused about this matter. So, what’s the correct option below?
Because you are not sure you should use "he might be Irish". Perhaps he is, perhaps he isn't. "He must be Irish" indicates there is almost no doubt... "his name is Sean O'Casey so he must be Irish"



a) He must be Irish. (* I am not sure).
No. You're 95% sure.



b) He might be Irish. (* I am not sure).

OK





2)It’s extremely necessary that Ursula goes home right now.



In this case, I suppose the correct answer is:



Ursula must go home right now (or) Ursula has to go home right now.
Right. Either.





3) He is prohibited from saying four-letter words in this place.



Here I suppose the answers are:



He musn’t say four-letter words in this place (or) He can’t say four-letter words in this place.

Again, both OK

Thank you very much,
Sophia

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Best wishes,
Sophia
 CalifJim's reply was promoted to an answer.