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