could crystallise
Verbo regular: crystallise - crystallised- crystallised

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could crystallise
you could crystallise
he could crystallise
we could crystallise
you could crystallise
they could crystallise 	I could be crystallising
you could be crystallising
he could be crystallising
we could be crystallising
you could be crystallising
they could be crystallising	I could have crystallised
you could have crystallised
he could have crystallised
we could have crystallised
you could have crystallised
they could have crystallised	I could have been crystallising
you could have been crystallising
he could have been crystallising
we could have been crystallising
you could have been crystallising
they could have been crystallising	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not crystallise
you could not crystallise
he could not crystallise
we could not crystallise
you could not crystallise
they could not crystallise 	I could not be crystallising
you could not be crystallising
he could not be crystallising
we could not be crystallising
you could not be crystallising
they could not be crystallising	I could not have crystallised
you could not have crystallised
he could not have crystallised
we could not have crystallised
you could not have crystallised
they could not have crystallised	I could not have been crystallising
you could not have been crystallising
he could not have been crystallising
we could not have been crystallising
you could not have been crystallising
they could not have been crystallising	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I crystallise?
could you crystallise?
could he crystallise?
could we crystallise?
could you crystallise?
could they crystallise? 	could I be crystallising?
could you be crystallising?
could he be crystallising?
could we be crystallising?
could you be crystallising?
could they be crystallising? 	could I have crystallised?
could you have crystallised?
could he have crystallised?
could we have crystallised?
could you have crystallised?
could they have crystallised? 	could I have been crystallising?
could you have been crystallising?
could he have been crystallising?
could we have been crystallising?
could you have been crystallising?
could they have been crystallising? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not crystallise?
could you not crystallise?
could he not crystallise?
could we not crystallise?
could you not crystallise?
could they not crystallise? 	could I not be crystallising?
could you not be crystallising?
could he not be crystallising?
could we not be crystallising?
could you not be crystallising?
could they not be crystallising? 	could I not have crystallised?
could you not have crystallised?
could he not have crystallised?
could we not have crystallised?
could you not have crystallised?
could they not have crystallised? 	could I not have been crystallising?
could you not have been crystallising?
could he not have been crystallising?
could we not have been crystallising?
could you not have been crystallising?
could they not have been crystallising?