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 silvia.patti
 
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							| Which is the correct option? 1. My parents must/have to go to work every day. 2. you mustn �t/shouldn �t use your mobile phone when you are driving Thanks Silvia |  21 May 2013      
					
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 mohamedthabet
 
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							| My parents have to go to work everyday = they need to in order to earn their living / their job requires that they go everyday
 
 You mustn �t use your mobile while driving = It �s forbidden by law  = if you do, you �ll be punished.
 
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 isabel queen
 
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							| I think that in the second one both are correct, but if you use mustn �s it �s because you are talking with an aurotrity point of view. And if you use it with shouldn �t it �s because you are talking with a friend point of view. |  21 May 2013     
					
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 MoodyMoody
 
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							| As libertybelle already mentioned, both answers to both questions are correct. In the first example, there is little difference in meaning. In the second, as mohamedthabet and isabel queen note, mustn �t is much stronger than shouldn �t. "Mustn �t" means that there will be serious consequences, such as getting a ticket or causing an accident. "Shouldn �t" means more that a course of action is undesirable but implies that the consequences are not that bad. I prefer mustn �t for the second example because using a cell or mobile phone while driving is quite hazardous, especially texting. |  21 May 2013     
					
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 yanogator
 
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							| To add one thing, "must" is much more formal than "have to". The meaning is the same, but the mood is different.   Bruce |  21 May 2013     
					
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 silvia.patti
 
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							| Thanks, they were two sentences of a test and I don �t want to mark a mistake if there isn �t. |  22 May 2013     
					
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