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		Grammar and Linguistics >  ´She mustn ´t have been late ´     
			
		  ´She mustn ´t have been late ´ 
		
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 Sniggy
 
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							| ´She mustn ´t have been late ´ 
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							| Dear colleagues! Tell me please what is wrong in the sentence  ´She mustn ´t have been late ´. Thanks! |  5 Jan 2015      
					
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 Abbes_Z
 
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							| Dear Sniggy,    Well, it depends on what modality you mean..  If you mean unadvisability in the past, then the proper whay to express it is; "She shouldn´t have been late." (i.e. using ´should´ as a modal perfect). But if you mean certainty in the past, then in this case you should use ´must´ as a modal perfect-- that is; "She must have been late".    I hope this helps.. ;) Cheers! |  5 Jan 2015     
					
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 mohamedthabet
 
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							|  If you want to express reproach / regret / or disaapproval about something that happened in the past, use shouldn ´t / oughtn ´t + have + past participle of the main verb = She shouldn ´t have been late.    If you want to make a deduction expressing certainty something didn ´t happen, use can ´t / couldn ´t + have + past participle = She can ´t / couldn ´t have been late. ( meaning : I ´m sure she wasn ´t late) |  5 Jan 2015     
					
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 Sniggy
 
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							| Thank you so much!!! Happy New Year! :) |  5 Jan 2015     
					
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