could perseverate
Verbe régulier : perseverate - perseverated- perseverated

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could perseverate
you could perseverate
he could perseverate
we could perseverate
you could perseverate
they could perseverate 	I could be perseverating
you could be perseverating
he could be perseverating
we could be perseverating
you could be perseverating
they could be perseverating	I could have perseverated
you could have perseverated
he could have perseverated
we could have perseverated
you could have perseverated
they could have perseverated	I could have been perseverating
you could have been perseverating
he could have been perseverating
we could have been perseverating
you could have been perseverating
they could have been perseverating	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not perseverate
you could not perseverate
he could not perseverate
we could not perseverate
you could not perseverate
they could not perseverate 	I could not be perseverating
you could not be perseverating
he could not be perseverating
we could not be perseverating
you could not be perseverating
they could not be perseverating	I could not have perseverated
you could not have perseverated
he could not have perseverated
we could not have perseverated
you could not have perseverated
they could not have perseverated	I could not have been perseverating
you could not have been perseverating
he could not have been perseverating
we could not have been perseverating
you could not have been perseverating
they could not have been perseverating	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I perseverate?
could you perseverate?
could he perseverate?
could we perseverate?
could you perseverate?
could they perseverate? 	could I be perseverating?
could you be perseverating?
could he be perseverating?
could we be perseverating?
could you be perseverating?
could they be perseverating? 	could I have perseverated?
could you have perseverated?
could he have perseverated?
could we have perseverated?
could you have perseverated?
could they have perseverated? 	could I have been perseverating?
could you have been perseverating?
could he have been perseverating?
could we have been perseverating?
could you have been perseverating?
could they have been perseverating? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not perseverate?
could you not perseverate?
could he not perseverate?
could we not perseverate?
could you not perseverate?
could they not perseverate? 	could I not be perseverating?
could you not be perseverating?
could he not be perseverating?
could we not be perseverating?
could you not be perseverating?
could they not be perseverating? 	could I not have perseverated?
could you not have perseverated?
could he not have perseverated?
could we not have perseverated?
could you not have perseverated?
could they not have perseverated? 	could I not have been perseverating?
could you not have been perseverating?
could he not have been perseverating?
could we not have been perseverating?
could you not have been perseverating?
could they not have been perseverating?