could carbonise
Regular verb: carbonise - carbonised- carbonised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could carbonise
you could carbonise
he could carbonise
we could carbonise
you could carbonise
they could carbonise 	I could be carbonising
you could be carbonising
he could be carbonising
we could be carbonising
you could be carbonising
they could be carbonising	I could have carbonised
you could have carbonised
he could have carbonised
we could have carbonised
you could have carbonised
they could have carbonised	I could have been carbonising
you could have been carbonising
he could have been carbonising
we could have been carbonising
you could have been carbonising
they could have been carbonising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't carbonise
you couldn't carbonise
he couldn't carbonise
we couldn't carbonise
you couldn't carbonise
they couldn't carbonise 	I couldn't be carbonising
you couldn't be carbonising
he couldn't be carbonising
we couldn't be carbonising
you couldn't be carbonising
they couldn't be carbonising	I couldn't have carbonised
you couldn't have carbonised
he couldn't have carbonised
we couldn't have carbonised
you couldn't have carbonised
they couldn't have carbonised	I couldn't have been carbonising
you couldn't have been carbonising
he couldn't have been carbonising
we couldn't have been carbonising
you couldn't have been carbonising
they couldn't have been carbonising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I carbonise?
could you carbonise?
could he carbonise?
could we carbonise?
could you carbonise?
could they carbonise? 	could I be carbonising?
could you be carbonising?
could he be carbonising?
could we be carbonising?
could you be carbonising?
could they be carbonising? 	could I have carbonised?
could you have carbonised?
could he have carbonised?
could we have carbonised?
could you have carbonised?
could they have carbonised? 	could I have been carbonising?
could you have been carbonising?
could he have been carbonising?
could we have been carbonising?
could you have been carbonising?
could they have been carbonising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I carbonise?
couldn't you carbonise?
couldn't he carbonise?
couldn't we carbonise?
couldn't you carbonise?
couldn't they carbonise? 	couldn't I be carbonising?
couldn't you be carbonising?
couldn't he be carbonising?
couldn't we be carbonising?
couldn't you be carbonising?
couldn't they be carbonising? 	couldn't I have carbonised?
couldn't you have carbonised?
couldn't he have carbonised?
couldn't we have carbonised?
couldn't you have carbonised?
couldn't they have carbonised? 	couldn't I have been carbonising?
couldn't you have been carbonising?
couldn't he have been carbonising?
couldn't we have been carbonising?
couldn't you have been carbonising?
couldn't they have been carbonising?