could naturalise
Regular verb: naturalise - naturalised- naturalised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could naturalise
you could naturalise
she could naturalise
we could naturalise
you could naturalise
they could naturalise 	I could be naturalising
you could be naturalising
she could be naturalising
we could be naturalising
you could be naturalising
they could be naturalising	I could have naturalised
you could have naturalised
she could have naturalised
we could have naturalised
you could have naturalised
they could have naturalised	I could have been naturalising
you could have been naturalising
she could have been naturalising
we could have been naturalising
you could have been naturalising
they could have been naturalising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not naturalise
you could not naturalise
she could not naturalise
we could not naturalise
you could not naturalise
they could not naturalise 	I could not be naturalising
you could not be naturalising
she could not be naturalising
we could not be naturalising
you could not be naturalising
they could not be naturalising	I could not have naturalised
you could not have naturalised
she could not have naturalised
we could not have naturalised
you could not have naturalised
they could not have naturalised	I could not have been naturalising
you could not have been naturalising
she could not have been naturalising
we could not have been naturalising
you could not have been naturalising
they could not have been naturalising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I naturalise?
could you naturalise?
could she naturalise?
could we naturalise?
could you naturalise?
could they naturalise? 	could I be naturalising?
could you be naturalising?
could she be naturalising?
could we be naturalising?
could you be naturalising?
could they be naturalising? 	could I have naturalised?
could you have naturalised?
could she have naturalised?
could we have naturalised?
could you have naturalised?
could they have naturalised? 	could I have been naturalising?
could you have been naturalising?
could she have been naturalising?
could we have been naturalising?
could you have been naturalising?
could they have been naturalising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not naturalise?
could you not naturalise?
could she not naturalise?
could we not naturalise?
could you not naturalise?
could they not naturalise? 	could I not be naturalising?
could you not be naturalising?
could she not be naturalising?
could we not be naturalising?
could you not be naturalising?
could they not be naturalising? 	could I not have naturalised?
could you not have naturalised?
could she not have naturalised?
could we not have naturalised?
could you not have naturalised?
could they not have naturalised? 	could I not have been naturalising?
could you not have been naturalising?
could she not have been naturalising?
could we not have been naturalising?
could you not have been naturalising?
could they not have been naturalising?