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		Grammar and Linguistics > Present  perfect or passive voice ?     
			
		 Present  perfect or passive voice ? 
		
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 xbassemx
 
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							| Present  perfect or passive voice ? 
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							| Which tense is suitable for this sentence: the rocket fuel used since 2007 incident in which some experts (to kill) ........................ when testing the spaceship.    |  19 Nov 2014      
					
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 Teacher Laura!
 
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							| I would use the passive voice: "some experts were killed when testing the spaceship". |  19 Nov 2014     
					
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 yanogator
 
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							| Yes, the present perfect active isn �t an option here.
Bruce |  19 Nov 2014     
					
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 noursen
 
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							|  the passive is the choice here because the action happened and finished   "were killed"  |  19 Nov 2014     
					
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 mohamedthabet
 
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							| If your sentence starts with "The rocket fuel.., then I think the present perfect passive is to use in the clause preceding "since" and the past simple passive in the one following it.  The CORRECT SENTENCE, as I see it, is the following: The rocket fuel has been used since the 2007 incident, in which some experts were killed when testing the spaceship. |  19 Nov 2014     
					
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