I could dematerialize you could dematerialize she could dematerialize we could dematerialize you could dematerialize they could dematerialize
V-ing form
I could be dematerializing you could be dematerializing she could be dematerializing we could be dematerializing you could be dematerializing they could be dematerializing
Perfect
I could have dematerialized you could have dematerialized she 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 she could have been dematerializing we could have been dematerializing you could have been dematerializing they could have been dematerializing
Negation
Simple form
I could not dematerialize you could not dematerialize she could not dematerialize we could not dematerialize you could not dematerialize they could not dematerialize
V-ing form
I could not be dematerializing you could not be dematerializing she could not be dematerializing we could not be dematerializing you could not be dematerializing they could not be dematerializing
Perfect
I could not have dematerialized you could not have dematerialized she could not have dematerialized we could not have dematerialized you could not have dematerialized they could not have dematerialized
V-ing perfect
I could not have been dematerializing you could not have been dematerializing she could not have been dematerializing we could not have been dematerializing you could not have been dematerializing they could not have been dematerializing
Interrogative form
Simple form
could I dematerialize? could you dematerialize? could she dematerialize? could we dematerialize? could you dematerialize? could they dematerialize?
V-ing form
could I be dematerializing? could you be dematerializing? could she be dematerializing? could we be dematerializing? could you be dematerializing? could they be dematerializing?
Perfect
could I have dematerialized? could you have dematerialized? could she 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 she have been dematerializing? could we have been dematerializing? could you have been dematerializing? could they have been dematerializing?
Interro-negative form
Simple form
could I not dematerialize? could you not dematerialize? could she not dematerialize? could we not dematerialize? could you not dematerialize? could they not dematerialize?
V-ing form
could I not be dematerializing? could you not be dematerializing? could she not be dematerializing? could we not be dematerializing? could you not be dematerializing? could they not be dematerializing?
Perfect
could I not have dematerialized? could you not have dematerialized? could she not have dematerialized? could we not have dematerialized? could you not have dematerialized? could they not have dematerialized?
V-ing perfect
could I not have been dematerializing? could you not have been dematerializing? could she not have been dematerializing? could we not have been dematerializing? could you not have been dematerializing? could they not have been dematerializing?