English verb conjugation
COULD DEMATERIALISE

Regular verb: dematerialise - dematerialised - dematerialised

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?