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
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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't perseverate
you couldn't perseverate
he couldn't perseverate
we couldn't perseverate
you couldn't perseverate
they couldn't perseverate 	I couldn't be perseverating
you couldn't be perseverating
he couldn't be perseverating
we couldn't be perseverating
you couldn't be perseverating
they couldn't be perseverating	I couldn't have perseverated
you couldn't have perseverated
he couldn't have perseverated
we couldn't have perseverated
you couldn't have perseverated
they couldn't have perseverated	I couldn't have been perseverating
you couldn't have been perseverating
he couldn't have been perseverating
we couldn't have been perseverating
you couldn't have been perseverating
they couldn't have been perseverating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I perseverate?
couldn't you perseverate?
couldn't he perseverate?
couldn't we perseverate?
couldn't you perseverate?
couldn't they perseverate? 	couldn't I be perseverating?
couldn't you be perseverating?
couldn't he be perseverating?
couldn't we be perseverating?
couldn't you be perseverating?
couldn't they be perseverating? 	couldn't I have perseverated?
couldn't you have perseverated?
couldn't he have perseverated?
couldn't we have perseverated?
couldn't you have perseverated?
couldn't they have perseverated? 	couldn't I have been perseverating?
couldn't you have been perseverating?
couldn't he have been perseverating?
couldn't we have been perseverating?
couldn't you have been perseverating?
couldn't they have been perseverating?