could precertify
Verbo regular: precertify - precertified- precertified

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could precertify
you could precertify
he could precertify
we could precertify
you could precertify
they could precertify 	I could be precertifying
you could be precertifying
he could be precertifying
we could be precertifying
you could be precertifying
they could be precertifying	I could have precertified
you could have precertified
he could have precertified
we could have precertified
you could have precertified
they could have precertified	I could have been precertifying
you could have been precertifying
he could have been precertifying
we could have been precertifying
you could have been precertifying
they could have been precertifying	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't precertify
you couldn't precertify
he couldn't precertify
we couldn't precertify
you couldn't precertify
they couldn't precertify 	I couldn't be precertifying
you couldn't be precertifying
he couldn't be precertifying
we couldn't be precertifying
you couldn't be precertifying
they couldn't be precertifying	I couldn't have precertified
you couldn't have precertified
he couldn't have precertified
we couldn't have precertified
you couldn't have precertified
they couldn't have precertified	I couldn't have been precertifying
you couldn't have been precertifying
he couldn't have been precertifying
we couldn't have been precertifying
you couldn't have been precertifying
they couldn't have been precertifying	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I precertify?
could you precertify?
could he precertify?
could we precertify?
could you precertify?
could they precertify? 	could I be precertifying?
could you be precertifying?
could he be precertifying?
could we be precertifying?
could you be precertifying?
could they be precertifying? 	could I have precertified?
could you have precertified?
could he have precertified?
could we have precertified?
could you have precertified?
could they have precertified? 	could I have been precertifying?
could you have been precertifying?
could he have been precertifying?
could we have been precertifying?
could you have been precertifying?
could they have been precertifying? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I precertify?
couldn't you precertify?
couldn't he precertify?
couldn't we precertify?
couldn't you precertify?
couldn't they precertify? 	couldn't I be precertifying?
couldn't you be precertifying?
couldn't he be precertifying?
couldn't we be precertifying?
couldn't you be precertifying?
couldn't they be precertifying? 	couldn't I have precertified?
couldn't you have precertified?
couldn't he have precertified?
couldn't we have precertified?
couldn't you have precertified?
couldn't they have precertified? 	couldn't I have been precertifying?
couldn't you have been precertifying?
couldn't he have been precertifying?
couldn't we have been precertifying?
couldn't you have been precertifying?
couldn't they have been precertifying?