I could dematerialise you could dematerialise she could dematerialise we could dematerialise you could dematerialise they could dematerialise
V-ing form
I could be dematerialising you could be dematerialising she could be dematerialising we could be dematerialising you could be dematerialising they could be dematerialising
Perfect
I could have dematerialised you could have dematerialised she could have dematerialised we could have dematerialised you could have dematerialised they could have dematerialised
V-ing perfect
I could have been dematerialising you could have been dematerialising she could have been dematerialising we could have been dematerialising you could have been dematerialising they could have been dematerialising
Negation
Simple form
I could not dematerialise you could not dematerialise she could not dematerialise we could not dematerialise you could not dematerialise they could not dematerialise
V-ing form
I could not be dematerialising you could not be dematerialising she could not be dematerialising we could not be dematerialising you could not be dematerialising they could not be dematerialising
Perfect
I could not have dematerialised you could not have dematerialised she could not have dematerialised we could not have dematerialised you could not have dematerialised they could not have dematerialised
V-ing perfect
I could not have been dematerialising you could not have been dematerialising she could not have been dematerialising we could not have been dematerialising you could not have been dematerialising they could not have been dematerialising
Interrogative form
Simple form
could I dematerialise? could you dematerialise? could she dematerialise? could we dematerialise? could you dematerialise? could they dematerialise?
V-ing form
could I be dematerialising? could you be dematerialising? could she be dematerialising? could we be dematerialising? could you be dematerialising? could they be dematerialising?
Perfect
could I have dematerialised? could you have dematerialised? could she have dematerialised? could we have dematerialised? could you have dematerialised? could they have dematerialised?
V-ing perfect
could I have been dematerialising? could you have been dematerialising? could she have been dematerialising? could we have been dematerialising? could you have been dematerialising? could they have been dematerialising?
Interro-negative form
Simple form
could I not dematerialise? could you not dematerialise? could she not dematerialise? could we not dematerialise? could you not dematerialise? could they not dematerialise?
V-ing form
could I not be dematerialising? could you not be dematerialising? could she not be dematerialising? could we not be dematerialising? could you not be dematerialising? could they not be dematerialising?
Perfect
could I not have dematerialised? could you not have dematerialised? could she not have dematerialised? could we not have dematerialised? could you not have dematerialised? could they not have dematerialised?
V-ing perfect
could I not have been dematerialising? could you not have been dematerialising? could she not have been dematerialising? could we not have been dematerialising? could you not have been dematerialising? could they not have been dematerialising?