could perseverate
Verbo regular: perseverate - perseverated- perseverated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could perseverate
you could perseverate
she could perseverate
we could perseverate
you could perseverate
they could perseverate 	I could be perseverating
you could be perseverating
she could be perseverating
we could be perseverating
you could be perseverating
they could be perseverating	I could have perseverated
you could have perseverated
she 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
she could have been perseverating
we could have been perseverating
you could have been perseverating
they could have been perseverating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not perseverate
you could not perseverate
she 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
she 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
she 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
she could not have been perseverating
we could not have been perseverating
you could not have been perseverating
they could not have been perseverating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I perseverate?
could you perseverate?
could she perseverate?
could we perseverate?
could you perseverate?
could they perseverate? 	could I be perseverating?
could you be perseverating?
could she be perseverating?
could we be perseverating?
could you be perseverating?
could they be perseverating? 	could I have perseverated?
could you have perseverated?
could she 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 she have been perseverating?
could we have been perseverating?
could you have been perseverating?
could they have been perseverating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not perseverate?
could you not perseverate?
could she 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 she 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 she 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 she not have been perseverating?
could we not have been perseverating?
could you not have been perseverating?
could they not have been perseverating?