could carbonize
Regular verb: carbonize - carbonized- carbonized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could carbonize
you could carbonize
he could carbonize
we could carbonize
you could carbonize
they could carbonize 	I could be carbonizing
you could be carbonizing
he could be carbonizing
we could be carbonizing
you could be carbonizing
they could be carbonizing	I could have carbonized
you could have carbonized
he could have carbonized
we could have carbonized
you could have carbonized
they could have carbonized	I could have been carbonizing
you could have been carbonizing
he could have been carbonizing
we could have been carbonizing
you could have been carbonizing
they could have been carbonizing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't carbonize
you couldn't carbonize
he couldn't carbonize
we couldn't carbonize
you couldn't carbonize
they couldn't carbonize 	I couldn't be carbonizing
you couldn't be carbonizing
he couldn't be carbonizing
we couldn't be carbonizing
you couldn't be carbonizing
they couldn't be carbonizing	I couldn't have carbonized
you couldn't have carbonized
he couldn't have carbonized
we couldn't have carbonized
you couldn't have carbonized
they couldn't have carbonized	I couldn't have been carbonizing
you couldn't have been carbonizing
he couldn't have been carbonizing
we couldn't have been carbonizing
you couldn't have been carbonizing
they couldn't have been carbonizing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I carbonize?
could you carbonize?
could he carbonize?
could we carbonize?
could you carbonize?
could they carbonize? 	could I be carbonizing?
could you be carbonizing?
could he be carbonizing?
could we be carbonizing?
could you be carbonizing?
could they be carbonizing? 	could I have carbonized?
could you have carbonized?
could he have carbonized?
could we have carbonized?
could you have carbonized?
could they have carbonized? 	could I have been carbonizing?
could you have been carbonizing?
could he have been carbonizing?
could we have been carbonizing?
could you have been carbonizing?
could they have been carbonizing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I carbonize?
couldn't you carbonize?
couldn't he carbonize?
couldn't we carbonize?
couldn't you carbonize?
couldn't they carbonize? 	couldn't I be carbonizing?
couldn't you be carbonizing?
couldn't he be carbonizing?
couldn't we be carbonizing?
couldn't you be carbonizing?
couldn't they be carbonizing? 	couldn't I have carbonized?
couldn't you have carbonized?
couldn't he have carbonized?
couldn't we have carbonized?
couldn't you have carbonized?
couldn't they have carbonized? 	couldn't I have been carbonizing?
couldn't you have been carbonizing?
couldn't he have been carbonizing?
couldn't we have been carbonizing?
couldn't you have been carbonizing?
couldn't they have been carbonizing?