could dematerialise
Regular verb: dematerialise - dematerialised- dematerialised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could dematerialise
you could dematerialise
he could dematerialise
we could dematerialise
you could dematerialise
they could dematerialise 	I could be dematerialising
you could be dematerialising
he could be dematerialising
we could be dematerialising
you could be dematerialising
they could be dematerialising	I could have dematerialised
you could have dematerialised
he could have dematerialised
we could have dematerialised
you could have dematerialised
they could have dematerialised	I could have been dematerialising
you could have been dematerialising
he could have been dematerialising
we could have been dematerialising
you could have been dematerialising
they could have been dematerialising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't dematerialise
you couldn't dematerialise
he couldn't dematerialise
we couldn't dematerialise
you couldn't dematerialise
they couldn't dematerialise 	I couldn't be dematerialising
you couldn't be dematerialising
he couldn't be dematerialising
we couldn't be dematerialising
you couldn't be dematerialising
they couldn't be dematerialising	I couldn't have dematerialised
you couldn't have dematerialised
he couldn't have dematerialised
we couldn't have dematerialised
you couldn't have dematerialised
they couldn't have dematerialised	I couldn't have been dematerialising
you couldn't have been dematerialising
he couldn't have been dematerialising
we couldn't have been dematerialising
you couldn't have been dematerialising
they couldn't have been dematerialising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I dematerialise?
could you dematerialise?
could he dematerialise?
could we dematerialise?
could you dematerialise?
could they dematerialise? 	could I be dematerialising?
could you be dematerialising?
could he be dematerialising?
could we be dematerialising?
could you be dematerialising?
could they be dematerialising? 	could I have dematerialised?
could you have dematerialised?
could he have dematerialised?
could we have dematerialised?
could you have dematerialised?
could they have dematerialised? 	could I have been dematerialising?
could you have been dematerialising?
could he have been dematerialising?
could we have been dematerialising?
could you have been dematerialising?
could they have been dematerialising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I dematerialise?
couldn't you dematerialise?
couldn't he dematerialise?
couldn't we dematerialise?
couldn't you dematerialise?
couldn't they dematerialise? 	couldn't I be dematerialising?
couldn't you be dematerialising?
couldn't he be dematerialising?
couldn't we be dematerialising?
couldn't you be dematerialising?
couldn't they be dematerialising? 	couldn't I have dematerialised?
couldn't you have dematerialised?
couldn't he have dematerialised?
couldn't we have dematerialised?
couldn't you have dematerialised?
couldn't they have dematerialised? 	couldn't I have been dematerialising?
couldn't you have been dematerialising?
couldn't he have been dematerialising?
couldn't we have been dematerialising?
couldn't you have been dematerialising?
couldn't they have been dematerialising?