could dematerialize
Regular verb: dematerialize - dematerialized- dematerialized

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could dematerialize
you could dematerialize
he could dematerialize
we could dematerialize
you could dematerialize
they could dematerialize 	I could be dematerializing
you could be dematerializing
he could be dematerializing
we could be dematerializing
you could be dematerializing
they could be dematerializing	I could have dematerialized
you could have dematerialized
he could have dematerialized
we could have dematerialized
you could have dematerialized
they could have dematerialized	I could have been dematerializing
you could have been dematerializing
he could have been dematerializing
we could have been dematerializing
you could have been dematerializing
they could have been dematerializing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't dematerialize
you couldn't dematerialize
he couldn't dematerialize
we couldn't dematerialize
you couldn't dematerialize
they couldn't dematerialize 	I couldn't be dematerializing
you couldn't be dematerializing
he couldn't be dematerializing
we couldn't be dematerializing
you couldn't be dematerializing
they couldn't be dematerializing	I couldn't have dematerialized
you couldn't have dematerialized
he couldn't have dematerialized
we couldn't have dematerialized
you couldn't have dematerialized
they couldn't have dematerialized	I couldn't have been dematerializing
you couldn't have been dematerializing
he couldn't have been dematerializing
we couldn't have been dematerializing
you couldn't have been dematerializing
they couldn't have been dematerializing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I dematerialize?
could you dematerialize?
could he dematerialize?
could we dematerialize?
could you dematerialize?
could they dematerialize? 	could I be dematerializing?
could you be dematerializing?
could he be dematerializing?
could we be dematerializing?
could you be dematerializing?
could they be dematerializing? 	could I have dematerialized?
could you have dematerialized?
could he have dematerialized?
could we have dematerialized?
could you have dematerialized?
could they have dematerialized? 	could I have been dematerializing?
could you have been dematerializing?
could he have been dematerializing?
could we have been dematerializing?
could you have been dematerializing?
could they have been dematerializing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I dematerialize?
couldn't you dematerialize?
couldn't he dematerialize?
couldn't we dematerialize?
couldn't you dematerialize?
couldn't they dematerialize? 	couldn't I be dematerializing?
couldn't you be dematerializing?
couldn't he be dematerializing?
couldn't we be dematerializing?
couldn't you be dematerializing?
couldn't they be dematerializing? 	couldn't I have dematerialized?
couldn't you have dematerialized?
couldn't he have dematerialized?
couldn't we have dematerialized?
couldn't you have dematerialized?
couldn't they have dematerialized? 	couldn't I have been dematerializing?
couldn't you have been dematerializing?
couldn't he have been dematerializing?
couldn't we have been dematerializing?
couldn't you have been dematerializing?
couldn't they have been dematerializing?