I could bituminise you could bituminise he could bituminise we could bituminise you could bituminise they could bituminise
V-ing form
I could be bituminising you could be bituminising he could be bituminising we could be bituminising you could be bituminising they could be bituminising
Perfect
I could have bituminised you could have bituminised he could have bituminised we could have bituminised you could have bituminised they could have bituminised
V-ing perfect
I could have been bituminising you could have been bituminising he could have been bituminising we could have been bituminising you could have been bituminising they could have been bituminising
Negation
Simple form
I couldn't bituminise you couldn't bituminise he couldn't bituminise we couldn't bituminise you couldn't bituminise they couldn't bituminise
V-ing form
I couldn't be bituminising you couldn't be bituminising he couldn't be bituminising we couldn't be bituminising you couldn't be bituminising they couldn't be bituminising
Perfect
I couldn't have bituminised you couldn't have bituminised he couldn't have bituminised we couldn't have bituminised you couldn't have bituminised they couldn't have bituminised
V-ing perfect
I couldn't have been bituminising you couldn't have been bituminising he couldn't have been bituminising we couldn't have been bituminising you couldn't have been bituminising they couldn't have been bituminising
Interrogative form
Simple form
could I bituminise? could you bituminise? could he bituminise? could we bituminise? could you bituminise? could they bituminise?
V-ing form
could I be bituminising? could you be bituminising? could he be bituminising? could we be bituminising? could you be bituminising? could they be bituminising?
Perfect
could I have bituminised? could you have bituminised? could he have bituminised? could we have bituminised? could you have bituminised? could they have bituminised?
V-ing perfect
could I have been bituminising? could you have been bituminising? could he have been bituminising? could we have been bituminising? could you have been bituminising? could they have been bituminising?
Interro-negative form
Simple form
couldn't I bituminise? couldn't you bituminise? couldn't he bituminise? couldn't we bituminise? couldn't you bituminise? couldn't they bituminise?
V-ing form
couldn't I be bituminising? couldn't you be bituminising? couldn't he be bituminising? couldn't we be bituminising? couldn't you be bituminising? couldn't they be bituminising?
Perfect
couldn't I have bituminised? couldn't you have bituminised? couldn't he have bituminised? couldn't we have bituminised? couldn't you have bituminised? couldn't they have bituminised?
V-ing perfect
couldn't I have been bituminising? couldn't you have been bituminising? couldn't he have been bituminising? couldn't we have been bituminising? couldn't you have been bituminising? couldn't they have been bituminising?