could entomb
Regular verb: entomb - entombed- entombed

Affirmation 	
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I could entomb
you could entomb
he could entomb
we could entomb
you could entomb
they could entomb 	I could be entombing
you could be entombing
he could be entombing
we could be entombing
you could be entombing
they could be entombing	I could have entombed
you could have entombed
he could have entombed
we could have entombed
you could have entombed
they could have entombed	I could have been entombing
you could have been entombing
he could have been entombing
we could have been entombing
you could have been entombing
they could have been entombing	

Negation 	
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I couldn't entomb
you couldn't entomb
he couldn't entomb
we couldn't entomb
you couldn't entomb
they couldn't entomb 	I couldn't be entombing
you couldn't be entombing
he couldn't be entombing
we couldn't be entombing
you couldn't be entombing
they couldn't be entombing	I couldn't have entombed
you couldn't have entombed
he couldn't have entombed
we couldn't have entombed
you couldn't have entombed
they couldn't have entombed	I couldn't have been entombing
you couldn't have been entombing
he couldn't have been entombing
we couldn't have been entombing
you couldn't have been entombing
they couldn't have been entombing	

Interrogative form 	
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could I entomb?
could you entomb?
could he entomb?
could we entomb?
could you entomb?
could they entomb? 	could I be entombing?
could you be entombing?
could he be entombing?
could we be entombing?
could you be entombing?
could they be entombing? 	could I have entombed?
could you have entombed?
could he have entombed?
could we have entombed?
could you have entombed?
could they have entombed? 	could I have been entombing?
could you have been entombing?
could he have been entombing?
could we have been entombing?
could you have been entombing?
could they have been entombing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I entomb?
couldn't you entomb?
couldn't he entomb?
couldn't we entomb?
couldn't you entomb?
couldn't they entomb? 	couldn't I be entombing?
couldn't you be entombing?
couldn't he be entombing?
couldn't we be entombing?
couldn't you be entombing?
couldn't they be entombing? 	couldn't I have entombed?
couldn't you have entombed?
couldn't he have entombed?
couldn't we have entombed?
couldn't you have entombed?
couldn't they have entombed? 	couldn't I have been entombing?
couldn't you have been entombing?
couldn't he have been entombing?
couldn't we have been entombing?
couldn't you have been entombing?
couldn't they have been entombing?