could catalyse
Verbo regular: catalyse - catalysed- catalysed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could catalyse
you could catalyse
he could catalyse
we could catalyse
you could catalyse
they could catalyse 	I could be catalysing
you could be catalysing
he could be catalysing
we could be catalysing
you could be catalysing
they could be catalysing	I could have catalysed
you could have catalysed
he could have catalysed
we could have catalysed
you could have catalysed
they could have catalysed	I could have been catalysing
you could have been catalysing
he could have been catalysing
we could have been catalysing
you could have been catalysing
they could have been catalysing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not catalyse
you could not catalyse
he could not catalyse
we could not catalyse
you could not catalyse
they could not catalyse 	I could not be catalysing
you could not be catalysing
he could not be catalysing
we could not be catalysing
you could not be catalysing
they could not be catalysing	I could not have catalysed
you could not have catalysed
he could not have catalysed
we could not have catalysed
you could not have catalysed
they could not have catalysed	I could not have been catalysing
you could not have been catalysing
he could not have been catalysing
we could not have been catalysing
you could not have been catalysing
they could not have been catalysing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I catalyse?
could you catalyse?
could he catalyse?
could we catalyse?
could you catalyse?
could they catalyse? 	could I be catalysing?
could you be catalysing?
could he be catalysing?
could we be catalysing?
could you be catalysing?
could they be catalysing? 	could I have catalysed?
could you have catalysed?
could he have catalysed?
could we have catalysed?
could you have catalysed?
could they have catalysed? 	could I have been catalysing?
could you have been catalysing?
could he have been catalysing?
could we have been catalysing?
could you have been catalysing?
could they have been catalysing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not catalyse?
could you not catalyse?
could he not catalyse?
could we not catalyse?
could you not catalyse?
could they not catalyse? 	could I not be catalysing?
could you not be catalysing?
could he not be catalysing?
could we not be catalysing?
could you not be catalysing?
could they not be catalysing? 	could I not have catalysed?
could you not have catalysed?
could he not have catalysed?
could we not have catalysed?
could you not have catalysed?
could they not have catalysed? 	could I not have been catalysing?
could you not have been catalysing?
could he not have been catalysing?
could we not have been catalysing?
could you not have been catalysing?
could they not have been catalysing?