could oxidise
Verbo regular: oxidise - oxidised- oxidised

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could oxidise
you could oxidise
she could oxidise
we could oxidise
you could oxidise
they could oxidise 	I could be oxidising
you could be oxidising
she could be oxidising
we could be oxidising
you could be oxidising
they could be oxidising	I could have oxidised
you could have oxidised
she could have oxidised
we could have oxidised
you could have oxidised
they could have oxidised	I could have been oxidising
you could have been oxidising
she could have been oxidising
we could have been oxidising
you could have been oxidising
they could have been oxidising	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't oxidise
you couldn't oxidise
she couldn't oxidise
we couldn't oxidise
you couldn't oxidise
they couldn't oxidise 	I couldn't be oxidising
you couldn't be oxidising
she couldn't be oxidising
we couldn't be oxidising
you couldn't be oxidising
they couldn't be oxidising	I couldn't have oxidised
you couldn't have oxidised
she couldn't have oxidised
we couldn't have oxidised
you couldn't have oxidised
they couldn't have oxidised	I couldn't have been oxidising
you couldn't have been oxidising
she couldn't have been oxidising
we couldn't have been oxidising
you couldn't have been oxidising
they couldn't have been oxidising	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I oxidise?
could you oxidise?
could she oxidise?
could we oxidise?
could you oxidise?
could they oxidise? 	could I be oxidising?
could you be oxidising?
could she be oxidising?
could we be oxidising?
could you be oxidising?
could they be oxidising? 	could I have oxidised?
could you have oxidised?
could she have oxidised?
could we have oxidised?
could you have oxidised?
could they have oxidised? 	could I have been oxidising?
could you have been oxidising?
could she have been oxidising?
could we have been oxidising?
could you have been oxidising?
could they have been oxidising? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I oxidise?
couldn't you oxidise?
couldn't she oxidise?
couldn't we oxidise?
couldn't you oxidise?
couldn't they oxidise? 	couldn't I be oxidising?
couldn't you be oxidising?
couldn't she be oxidising?
couldn't we be oxidising?
couldn't you be oxidising?
couldn't they be oxidising? 	couldn't I have oxidised?
couldn't you have oxidised?
couldn't she have oxidised?
couldn't we have oxidised?
couldn't you have oxidised?
couldn't they have oxidised? 	couldn't I have been oxidising?
couldn't you have been oxidising?
couldn't she have been oxidising?
couldn't we have been oxidising?
couldn't you have been oxidising?
couldn't they have been oxidising?