could nationalise
Regular verb: nationalise - nationalised- nationalised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could nationalise
you could nationalise
he could nationalise
we could nationalise
you could nationalise
they could nationalise 	I could be nationalising
you could be nationalising
he could be nationalising
we could be nationalising
you could be nationalising
they could be nationalising	I could have nationalised
you could have nationalised
he could have nationalised
we could have nationalised
you could have nationalised
they could have nationalised	I could have been nationalising
you could have been nationalising
he could have been nationalising
we could have been nationalising
you could have been nationalising
they could have been nationalising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't nationalise
you couldn't nationalise
he couldn't nationalise
we couldn't nationalise
you couldn't nationalise
they couldn't nationalise 	I couldn't be nationalising
you couldn't be nationalising
he couldn't be nationalising
we couldn't be nationalising
you couldn't be nationalising
they couldn't be nationalising	I couldn't have nationalised
you couldn't have nationalised
he couldn't have nationalised
we couldn't have nationalised
you couldn't have nationalised
they couldn't have nationalised	I couldn't have been nationalising
you couldn't have been nationalising
he couldn't have been nationalising
we couldn't have been nationalising
you couldn't have been nationalising
they couldn't have been nationalising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I nationalise?
could you nationalise?
could he nationalise?
could we nationalise?
could you nationalise?
could they nationalise? 	could I be nationalising?
could you be nationalising?
could he be nationalising?
could we be nationalising?
could you be nationalising?
could they be nationalising? 	could I have nationalised?
could you have nationalised?
could he have nationalised?
could we have nationalised?
could you have nationalised?
could they have nationalised? 	could I have been nationalising?
could you have been nationalising?
could he have been nationalising?
could we have been nationalising?
could you have been nationalising?
could they have been nationalising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I nationalise?
couldn't you nationalise?
couldn't he nationalise?
couldn't we nationalise?
couldn't you nationalise?
couldn't they nationalise? 	couldn't I be nationalising?
couldn't you be nationalising?
couldn't he be nationalising?
couldn't we be nationalising?
couldn't you be nationalising?
couldn't they be nationalising? 	couldn't I have nationalised?
couldn't you have nationalised?
couldn't he have nationalised?
couldn't we have nationalised?
couldn't you have nationalised?
couldn't they have nationalised? 	couldn't I have been nationalising?
couldn't you have been nationalising?
couldn't he have been nationalising?
couldn't we have been nationalising?
couldn't you have been nationalising?
couldn't they have been nationalising?